Up load de imagem não funciona

Bom dia a todos!

Tenho uma loja online e através do backoffice realizo algumas tarefas dentre as quais os envio de news letter. Para realizar este envio primeiro crio a newsletter e a salvo como uma imagem jpeg. De seguida, através do backoffice, crio uma nova newsletter, nomeio-a e clico no botão para escolher escolher e fazer o upload da imagem. Porém o script não faz o upload da imagem ou seja, o envio se realiza porém sem a imagem.

Abaixo transcrevo o script. Alguém me pode ajudar? Obrigado!

<?

include_once("protect_internalpage.php");
include_once("classes/Newsletter.php");
$obj = new Newsletter();

if($_GET["type"] == "edit" || $_POST["type"] == "send")

	$obj->_id = $_GET["id"];
	$obj->select();
}

if($_POST["type"] == "send")

	if($_POST["newsletter_target"] == "all")
	{
 include_once("../DBConnectorMSSQL.php");
 $CONNECTION_MSSQL = new DBConnectorMSSQL();
 $db_connection = $CONNECTION_MSSQL->connectDB();

 $obj->sendNewsletter();
	}
	else
	{
 $obj->sendNewsletterTest(); //$_POST["test_email"]
	}
}
?>

<script language="JavaScript" type="text/JavaScript">
function confirm()

	if(document.forms.form.name.value == "")
	{
 alert("Por favor preencha o nome associado à newsletter.");
	}
	else
	{
 document.forms.form.submit();
	}
}

function cancel()

	parent.frames['mainFrame'].location = 'internal_page.php?file=list_newsletters';
}

function sendNewsletter(type) //type = all | test

	document.forms.form.type.value = "send";
	document.forms.form.newsletter_target.value = type;
	if(type == "test")
	{
 //var text = prompt("Por favor introduza um email de teste.","");
 //if(text != "")
 //{
 //document.forms.form.test_email.value = text;
 document.forms.form.action = "internal_page.php?file=detail_newsletter&type=edit&id=<? echo $_GET["id"]; ?>";
 document.forms.form.submit();
 //}
 /*else
 {
 alert("Não inseriu qualquer email.");
 }*/

	}
	else
	{
 document.forms.form.action = "internal_page.php?file=detail_newsletter&type=edit&id=<? echo $_GET["id"]; ?>";
 document.forms.form.submit();
	}
}
</script>

<table width="90%" border="0" cellpadding="0" cellspacing="1" bordercolor="#FFFFFF" align="center">
<tr>
	<td>
 <table width="100%" height="23" border="0" cellpadding="0" cellspacing="0">
 <tr>
 <td height="1" bgcolor="#B64800"><img src="imagens/invi.gif" width="1" height="1"></td>
 <td height="1" bgcolor="#B64800"><img src="imagens/invi.gif" width="1" height="1"></td>
 </tr>
 <tr>
 <td align="left" valign="middle" bgcolor="#0047DD" class="titulosbarra">NEWSLETTER: <span class="subtitulo">Detalhes</span></td>
 <td width="16" align="left" valign="middle" bgcolor="#0047DD" class="titulosbarra"><img src="imagens/seta3.gif" width="5" height="4"></td>
 </tr>
 <tr>
 <td height="1" bgcolor="#B64800"><img src="imagens/invi.gif" width="1" height="1"></td>
 <td height="1" bgcolor="#B64800"><img src="imagens/invi.gif" width="1" height="1"></td>
 </tr>
 </table>
	</td>
</tr>
</table>
<br>
<form action="internal_page.php?file=list_newsletters" method="post" name="form" enctype="multipart/form-data">
<input type="hidden" name="type" value="<? echo $_GET["type"];?>">
<input type="hidden" name="id" value="<? echo $_GET["id"]; ?>">
<input type="hidden" name="newsletter_target" value="">
<input type="hidden" name="test_email" value="">
<table width="450" height="40" border="0" cellpadding="0" cellspacing="1">
<tr>
	<td class="tabela3">Nome</td>
	<td width="300" class="tabela1"><input class="inputtext3" type="text" name="name" value="<? echo $obj->_name; ?>" size="40" maxlength="50"></td>
</tr>
<tr>
	<td class="tabela3">Imagem</td>
	<td width="300" class="tabela1" align="left">
	<?
 if($obj->_url_file != "")
 echo "<img src='../" . $obj->_url_file . "' border=0 />";
	?>
	<br />
	<input type="file" name="Filedata" accept="application/jpeg, image/jpg"/>
 <br />(máx: 1Mb; JPG)
	</td>
</tr>
</table>

<table width="450" height="60" border="0" cellpadding="0" cellspacing="1">
<tr>
	<td colspan="3" height="1" bgcolor="#CCCCCC"><img src="imagens/invi.gif" width="1" height="1"></td>
</tr>
<tr>
	<td colspan="3" height="5" bgcolor="#FFFFFF"><img src="imagens/invi.gif" width="1" height="1"></td>
</tr>
<tr align="center" valign="middle">
	<td width="50%" valign="middle" align="right">
 <a href="#" onClick="cancel();" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('b1','','imagens/voltar2.gif',1)">
 <img src="imagens/voltar1.gif" name="b1" width="58" height="22" border="0">
 </a> 
	</td>
	<td width="1" bgcolor="#CCCCCC"><img src="imagens/invi.gif" width="1" height="1"></td>
	<td width="50%" align="left"> 
	<?
 if($_GET["type"] == "new")
 {
	?>
 <a href="#" onClick="confirm();" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('b5','','imagens/criar2.gif',1)">
 <img src="imagens/criar1.gif" name="b5" width="58" height="22" border="0">
 </a>
	<?
 }
 else
 {
	?>
 <a href="#" onClick="confirm();" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('b5','','imagens/alte2.gif',1)">
 <img src="imagens/alte1.gif" name="b5" width="58" height="22" border="0">
 </a>
 <br /> 
 <a href="#" onClick="sendNewsletter('all');" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('b5','','imagens/enviar.gif',1)">
 <img src="imagens/enviar.gif" name="b5" width="58" height="22" border="0">
 </a>
 <br /> 
 <a href="#" onClick="sendNewsletter('test');" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('b5','','imagens/teste_envio2.gif',1)">
 <img src="imagens/teste_envio1.gif" name="b5" width="88" height="22" border="0">
 </a>
	<?
 }
	?>
	</td>
</tr>
<tr>
	<td colspan="3" height="5" bgcolor="#FFFFFF"><img src="imagens/invi.gif" width="1" height="1"></td>
</tr>
<tr>
	<td colspan="3" height="1" bgcolor="#CCCCCC"><img src="imagens/invi.gif" width="1" height="1"></td>
</tr>
	<tr>
	<td colspan="3" height="5" bgcolor="#FFFFFF" align="center"> 
	<?
 if($_POST["type"] == "send")
 {
 if($_POST["newsletter_target"] == "all")
 {
 echo "Newsletter enviada para todos os clientes.";
 }
 else
 {
 echo "Email de Teste enviado para newswesybi@gmail.com;roberta.siqueira@wesybi.pt;renato.batisteli@wesybi.pt;renatobatisteli@gmail.com";
 }
 }
	?>
	</td>
</tr>
</table>
</form>