Validar formulario php

Galera, estou começando agora e gostaria da ajuda de vcs.

como faço para validar este formulário em Php( minha hospedagem e Locaweb)

Onde coloco o host da locaweb e o email para receber as mensagens.

<table align="center" border="0" cellpadding="0" cellspacing="0" width="500">

 

 <tbody>

 <tr>

 <td valign="top" width="447"><table width="548" height="150" border="0" align="center" cellpadding="2" cellspacing="2">

 <tbody>

 <tr>

 <td align="left" width="271"> *Nome Completo: <strong> </strong> </td>

 <td align="left" width="236"><br />

 *Email:</td>

 </tr>

 <tr>

 <td align="left"><input name="nome" size="45" maxlength="30" /></td>

 <td align="left"><input name="email" size="30" maxlength="30" /></td>

 </tr>

 <tr>

 <td colspan="2" align="left"><table border="0" cellpadding="2" cellspacing="2">

 <tbody>

 <tr>

 <td>*DDD: </td>

 <td width="32"><input name="DDD" size="3" maxlength="20" /></td>

 <td width="55">*Telefone:</td>

 <td width="80"> </td>

 </tr>

 <tr>

 <td width="31">DDD: </td>

 <td><input name="DDD_fax" size="3" maxlength="20" /></td>

 <td>Fax:</td>

 <td><input name="fax" size="10" maxlength="20" /></td>

 </tr>

 </tbody>

 </table>

 <input name="telefone" size="10" maxlength="20" /></td>

 </tr>

 </tbody>

 </table>

 <table align="center" border="0" cellpadding="2" cellspacing="2" width="500

 ">

 <tbody>

 <tr>

 <td><strong>Tipo de Acomodação:</strong></td>

 <td>Quantidade de Apartamentos:</td>

 </tr>

 <tr>

 <td width="140"><select name="tipo">

 <option name="tipo" value="" selected="selected"></option>

 <option name="tipo" value="Std Single" selected="selected">SUITE (DUPLO)</option>

 <option name="tipo" value="Std Double">SuiteSGL</option>

 <option name="tipo" value="Sup Single">SUITE (DUPLO)</option>

 <option name="tipo" value="Sup Double">SUITE (SGL)</option>

 <option name="tipo" value="Lux Single">SUITE (SGL)</option>

 <option name="tipo" value="Lux Double">SUITE DUPLO</option>

 <option name="tipo" value="Lux Double">SUITE TRIPLO</option>

 <option name="tipo" value="Lux Double">SUITE QUADRUPLO</option>

 

 </select> </td>

 <td width="526"><input name="qtd" size="8" maxlength="10" /> </td>

 </tr>

 <tr>

 <td>Quantidade de Hóspedes:</td>

 <td> </td>

 </tr>

 <tr>

 <td>Adultos:

 <input name="num_adulto" size="7" maxlength="20" /></td>

 <td> </td>

 </tr>

 <tr>

 <td height="30">Crianças:

 <input name="num_crianca" size="7" maxlength="20" /> </td>

 <td>Idade das Crianças:

 <input name="idade_crianca" size="14" maxlength="20" /> </td>

 </tr>

 

 <tr>

 <td> </td>

 </tr>

 

 <tr>

 <td><strong>Datas:</strong></td>

 <td><select name="select_calendar" id="select_calendar" onchange="goUrl(this,'home')">

 <option value="0">consulte calendário</option>

 <option value="2007">2007</option>

 <option value="2008">2008</option>

 <option value="2009">2009</option>

 <option value="2010">2010</option>

 </select></td>

 </tr>

 <tr>

 <td colspan="2"><table border="0" cellpadding="0" cellspacing="0" width="500">

 <tbody>

 <tr>

 <td colspan="3">Data de Chegada: </td>

 </tr>

 <tr>

 <td width="88">Dia:</td>

 <td width="128">Mês:</td>

 <td width="284">Ano:</td>

 </tr>

 <tr>

 <td><select name="dia">

 <option value="01" selected="selected">01</option>

 <option value="02">02</option>

 <option value="03">03</option>

 <option value="04">04</option>

 <option value="05">05</option>

 <option value="06">06</option>

 <option value="07">07</option>

 <option value="08">08</option>

 <option value="09">09</option>

 <option value="10">10</option>

 <option value="11">11</option>

 <option value="12">12</option>

 <option value="13">13</option>

 <option value="14">14</option>

 <option value="15">15</option>

 <option value="16">16</option>

 <option value="17">17</option>

 <option value="18">18</option>

 <option value="19">19</option>

 <option value="20">20</option>

 <option value="21">21</option>

 <option value="22">22</option>

 <option value="23">23</option>

 <option value="24">24</option>

 <option value="25">25</option>

 <option value="26">26</option>

 <option value="27">27</option>

 <option value="28">28</option>

 <option value="29">29</option>

 <option value="30">30</option>

 <option value="31">31</option>

 </select></td>

 <td><select name="mes">

 <option value="01" selected="selected">Janeiro</option>

 <option value="02">Fevereiro</option>

 <option value="03">Março</option>

 <option value="04">Abril</option>

 <option value="05">Maio</option>

 <option value="06">Junho</option>

 <option value="07">Julho</option>

 <option value="08">Agosto</option>

 <option value="09">Setembro</option>

 <option value="10">Outubro</option>

 <option value="11">Novembro</option>

 <option value="12">Dezembro</option>

 </select></td>

 <td><select name="ano">

 <option value="2007">2007</option>

 <option value="2008">2008</option>

 <option value="2009">2009</option>

 <option value="2010">2010</option>

 </select></td>

 </tr>

 </tbody>

 </table></td>

 </tr>

 <tr>

 <td colspan="2"><table border="0" cellpadding="0" cellspacing="0" width="500">

 <tbody>

 <tr>

 <td colspan="3">Data de Saída: </td>

 </tr>

 <tr>

 <td width="87">Dia:</td>

 <td width="130">Mês:</td>

 <td width="283">Ano:</td>

 </tr>

 <tr>

 <td><select name="dia_s">

 <option value="01" selected="selected">01</option>

 <option value="02">02</option>

 <option value="03">03</option>

 <option value="04">04</option>

 <option value="05">05</option>

 <option value="06">06</option>

 <option value="07">07</option>

 <option value="08">08</option>

 <option value="09">09</option>

 <option value="10">10</option>

 <option value="11">11</option>

 <option value="12">12</option>

 <option value="13">13</option>

 <option value="14">14</option>

 <option value="15">15</option>

 <option value="16">16</option>

 <option value="17">17</option>

 <option value="18">18</option>

 <option value="19">19</option>

 <option value="20">20</option>

 <option value="21">21</option>

 <option value="22">22</option>

 <option value="23">23</option>

 <option value="24">24</option>

 <option value="25">25</option>

 <option value="26">26</option>

 <option value="27">27</option>

 <option value="28">28</option>

 <option value="29">29</option>

 <option value="30">30</option>

 <option value="31">31</option>

 </select></td>

 <td><select name="mes_s">

 <option value="01" selected="selected">Janeiro</option>

 <option value="02">Fevereiro</option>

 <option value="03">Março</option>

 <option value="04">Abril</option>

 <option value="05">Maio</option>

 <option value="06">Junho</option>

 <option value="07">Julho</option>

 <option value="08">Agosto</option>

 <option value="09">Setembro</option>

 <option value="10">Outubro</option>

 <option value="11">Novembro</option>

 <option value="12">Dezembro</option>

 </select></td>

 <td><select name="ano_s">

 <option value="2007">2007</option>

 <option value="2008">2008</option>

 <option value="2009">2009</option>

 <option value="2010">2010</option>

 </select></td>

 </tr>

 </tbody>

 </table></td>

 </tr>

 <tr>

 <td colspan="2"><form id="form1" method="post" action="">

 <p>

 <label>

 <input type="submit" name="Submit" value="Enviar" />

 </label>

                 

 <input type="submit" name="Submit2" value="Limpar" /></p>

 </form>

 </td>

 </tr>

 </tbody>

 </table></td>

 <td valign="top" width="1"><br /></td>

 </tr>

 </tbody>

 </table>

<table align="center" border="0" cellpadding="0" cellspacing="0" width="500">

 

 <tbody>

 <tr>

 <td valign="top" width="447"><table width="548" height="150" border="0" align="center" cellpadding="2" cellspacing="2">

 <tbody>

 <tr>

 <td align="left" width="271"> *Nome Completo: <strong> </strong> </td>

 <td align="left" width="236"><br />

 *Email:</td>

 </tr>

 <tr>

 <td align="left"><input name="nome" size="45" maxlength="30" /></td>

 <td align="left"><input name="email" size="30" maxlength="30" /></td>

 </tr>

 <tr>

 <td colspan="2" align="left"><table border="0" cellpadding="2" cellspacing="2">

 <tbody>

 <tr>

 <td>*DDD: </td>

 <td width="32"><input name="DDD" size="3" maxlength="20" /></td>

 <td width="55">*Telefone:</td>

 <td width="80"> </td>

 </tr>

 <tr>

 <td width="31">DDD: </td>

 <td><input name="DDD_fax" size="3" maxlength="20" /></td>

 <td>Fax:</td>

 <td><input name="fax" size="10" maxlength="20" /></td>

 </tr>

 </tbody>

 </table>

 <input name="telefone" size="10" maxlength="20" /></td>

 </tr>

 </tbody>

 </table>

 <table align="center" border="0" cellpadding="2" cellspacing="2" width="500

 ">

 <tbody>

 <tr>

 <td><strong>Tipo de Acomodação:</strong></td>

 <td>Quantidade de Apartamentos:</td>

 </tr>

 <tr>

 <td width="140"><select name="tipo">

 <option name="tipo" value="" selected="selected"></option>

 <option name="tipo" value="Std Single" selected="selected">SUITE (DUPLO)</option>

 <option name="tipo" value="Std Double">SuiteSGL</option>

 <option name="tipo" value="Sup Single">SUITE (DUPLO)</option>

 <option name="tipo" value="Sup Double">SUITE (SGL)</option>

 <option name="tipo" value="Lux Single">SUITE (SGL)</option>

 <option name="tipo" value="Lux Double">SUITE DUPLO</option>

 <option name="tipo" value="Lux Double">SUITE TRIPLO</option>

 <option name="tipo" value="Lux Double">SUITE QUADRUPLO</option>

 

 </select> </td>

 <td width="526"><input name="qtd" size="8" maxlength="10" /> </td>

 </tr>

 <tr>

 <td>Quantidade de Hóspedes:</td>

 <td> </td>

 </tr>

 <tr>

 <td>Adultos:

 <input name="num_adulto" size="7" maxlength="20" /></td>

 <td> </td>

 </tr>

 <tr>

 <td height="30">Crianças:

 <input name="num_crianca" size="7" maxlength="20" /> </td>

 <td>Idade das Crianças:

 <input name="idade_crianca" size="14" maxlength="20" /> </td>

 </tr>

 

 <tr>

 <td> </td>

 </tr>

 

 <tr>

 <td><strong>Datas:</strong></td>

 <td><select name="select_calendar" id="select_calendar" onchange="goUrl(this,'home')">

 <option value="0">consulte calendário</option>

 <option value="2007">2007</option>

 <option value="2008">2008</option>

 <option value="2009">2009</option>

 <option value="2010">2010</option>

 </select></td>

 </tr>

 <tr>

 <td colspan="2"><table border="0" cellpadding="0" cellspacing="0" width="500">

 <tbody>

 <tr>

 <td colspan="3">Data de Chegada: </td>

 </tr>

 <tr>

 <td width="88">Dia:</td>

 <td width="128">Mês:</td>

 <td width="284">Ano:</td>

 </tr>

 <tr>

 <td><select name="dia">

 <option value="01" selected="selected">01</option>

 <option value="02">02</option>

 <option value="03">03</option>

 <option value="04">04</option>

 <option value="05">05</option>

 <option value="06">06</option>

 <option value="07">07</option>

 <option value="08">08</option>

 <option value="09">09</option>

 <option value="10">10</option>

 <option value="11">11</option>

 <option value="12">12</option>

 <option value="13">13</option>

 <option value="14">14</option>

 <option value="15">15</option>

 <option value="16">16</option>

 <option value="17">17</option>

 <option value="18">18</option>

 <option value="19">19</option>

 <option value="20">20</option>

 <option value="21">21</option>

 <option value="22">22</option>

 <option value="23">23</option>

 <option value="24">24</option>

 <option value="25">25</option>

 <option value="26">26</option>

 <option value="27">27</option>

 <option value="28">28</option>

 <option value="29">29</option>

 <option value="30">30</option>

 <option value="31">31</option>

 </select></td>

 <td><select name="mes">

 <option value="01" selected="selected">Janeiro</option>

 <option value="02">Fevereiro</option>

 <option value="03">Março</option>

 <option value="04">Abril</option>

 <option value="05">Maio</option>

 <option value="06">Junho</option>

 <option value="07">Julho</option>

 <option value="08">Agosto</option>

 <option value="09">Setembro</option>

 <option value="10">Outubro</option>

 <option value="11">Novembro</option>

 <option value="12">Dezembro</option>

 </select></td>

 <td><select name="ano">

 <option value="2007">2007</option>

 <option value="2008">2008</option>

 <option value="2009">2009</option>

 <option value="2010">2010</option>

 </select></td>

 </tr>

 </tbody>

 </table></td>

 </tr>

 <tr>

 <td colspan="2"><table border="0" cellpadding="0" cellspacing="0" width="500">

 <tbody>

 <tr>

 <td colspan="3">Data de Saída: </td>

 </tr>

 <tr>

 <td width="87">Dia:</td>

 <td width="130">Mês:</td>

 <td width="283">Ano:</td>

 </tr>

 <tr>

 <td><select name="dia_s">

 <option value="01" selected="selected">01</option>

 <option value="02">02</option>

 <option value="03">03</option>

 <option value="04">04</option>

 <option value="05">05</option>

 <option value="06">06</option>

 <option value="07">07</option>

 <option value="08">08</option>

 <option value="09">09</option>

 <option value="10">10</option>

 <option value="11">11</option>

 <option value="12">12</option>

 <option value="13">13</option>

 <option value="14">14</option>

 <option value="15">15</option>

 <option value="16">16</option>

 <option value="17">17</option>

 <option value="18">18</option>

 <option value="19">19</option>

 <option value="20">20</option>

 <option value="21">21</option>

 <option value="22">22</option>

 <option value="23">23</option>

 <option value="24">24</option>

 <option value="25">25</option>

 <option value="26">26</option>

 <option value="27">27</option>

 <option value="28">28</option>

 <option value="29">29</option>

 <option value="30">30</option>

 <option value="31">31</option>

 </select></td>

 <td><select name="mes_s">

 <option value="01" selected="selected">Janeiro</option>

 <option value="02">Fevereiro</option>

 <option value="03">Março</option>

 <option value="04">Abril</option>

 <option value="05">Maio</option>

 <option value="06">Junho</option>

 <option value="07">Julho</option>

 <option value="08">Agosto</option>

 <option value="09">Setembro</option>

 <option value="10">Outubro</option>

 <option value="11">Novembro</option>

 <option value="12">Dezembro</option>

 </select></td>

 <td><select name="ano_s">

 <option value="2007">2007</option>

 <option value="2008">2008</option>

 <option value="2009">2009</option>

 <option value="2010">2010</option>

 </select></td>

 </tr>

 </tbody>

 </table></td>

 </tr>

 <tr>

 <td colspan="2"><form id="form1" method="post" action="">

 <p>

 <label>

 <input type="submit" name="Submit" value="Enviar" />

 </label>

                 

 <input type="submit" name="Submit2" value="Limpar" /></p>

 </form>

 </td>

 </tr>

 </tbody>

 </table></td>

 <td valign="top" width="1"><br /></td>

 </tr>

 </tbody>

 </table>