css

gente é o seguinte, to criando um site mas to com uns probleminha com o css.

olha o que ta acontecendo (firefox):

Foto 1

Foto 2

nao sei pq ta acontecendo isso

body{

	margin:0px 0px 0px 0px;
	padding:0px 0px 0px 0px;
	background:#3C6;
}

a:link img{

	font-size:12px;
	border:none;
}

a:visited img{

	font-size:12px;
	border:none;
}

a:hover img{

	font-size:12px;
	border:none;
}

h1{

	font-size:25px;
	color:#F30;
	margin:0px;
}

h2{

	font-size:20px;
	color:#09F;
	margin:0px;
}

form input{

	margin:0px;
}
.bordaBox{
	bbackground: ttransparent;
	width:740px;
}
.borda{
	bbackground: ttransparent;
	width:660px;
}

.bordaBox .b1, .bordaBox .b2, .bordaBox .b3, .bordaBox .b4, .bordaBox .b1b, .bordaBox .b2b, .bordaBox .b3b, .bordaBox .b4b {

	display:block;
	overflow:hidden;
	font-size:1px;
}

.bordaBox .b1, .bordaBox .b2, .bordaBox .b3, .bordaBox .b1b, .bordaBox .b2b, .bordaBox .b3b {

	height:1px;
}

.bordaBox .b2, .bordaBox .b3, .bordaBox .b4 {

	background:#CECECE;
	border-left:1px solid #999;
	border-right:1px solid #999;
}

.bordaBox .b1 {

	margin:0 5px; background:#999;
}

.bordaBox .b2 {

	margin:0 3px; border-width:0 2px;
}

.bordaBox .b3 {

	margin:0 2px;
}

.bordaBox .b4 {

	height:2px; margin:0 1px;
}

.bordaBox .conteudo {

	padding:5px;
	display:block;
	background:#CECECE;
	border-left:1px solid #999;
	border-right:1px solid #999;
}
.encima{
	background:url(imagens/encima.gif) no-repeat;
	height:15px;
	width:680px;
}
.embaixo{
	background:url(imagens/embaixo.gif) no-repeat;
	height:15px;
	width:680px;
}
.encima_menu{
	background:url(imagens/encima_menu.gif) no-repeat;
	height:15px;
	width:300px;
}
.embaixo_menu{
	background:url(imagens/embaixo_menu.gif) no-repeat;
	height:15px;
	width:300px;
}
.encima_logar{
 margin:10px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
}
.embaixo_alunos{
	background:#006666;
 margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
	height:20px;
}
.embaixo_pais{
	background:#CC0033;
 margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
	height:20px;
}
.embaixo_professor{
	background:#663333;
 margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
	height:20px;
}
.linha_alunos{
	background:#006666;
 margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
	height:20px;
}
.linha_pais{
	background:#CC0033;
 margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
	height:20px;
}
.linha_professor{
	background:#663333;
 margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	width:980px;
	height:20px;
}
.conteudo2{
	padding:0px 8pt 0px 8pt;
	width:300px;
}
.conteudo3{
	padding:0px 14pt 0px 14pt;
	width:680px;
}
.pais{
	font-family:"Comic Sans MS", cursive;
	font-size:14px;
	color:#333;
}
.menu_membro{
	font-family:"Comic Sans MS", cursive;
	font-size:14px;
	color:#993;
}
.titulos{
	padding:0px 0px 0px 0px;
	margin:0px 0px 0px 0px;
}
.avatar{
	margin:5px 5px 5px 5px;
}
#estrutura_topo{
	margin:0px 0px 0px 0px;
	padding:0px 0px 0px 0px;
	background:#3C6;
}
#topo{
	padding:0px 0px 0px 0px;
	width:1000px;

}
#cabecalho{
	position:relative;
	width:1000px;
	height:200px;
}
#menu{
	padding:0px 0px 0px 0px;
	margin-bottom:10px;
}
#buscar{
	display:block;
	margin:15px 35px 0px 93px;
	width:800px;
	background:url(imagens/fundo_busca.gif) no-repeat;
	padding:5px 15px 15px 15px;
	text-align:center;
	font:"Palatino Linotype", "Book Antiqua", Palatino, serif;
	font-size:14px;
}
#opcoes{
	display:none;
	margin:15px 35px 0px 93px;
	width:800px;
	background:url(imagens/fundo_opcoes.gif) no-repeat;
	padding:5px 15px 15px 15px;
	text-align:center;
	font:"Palatino Linotype", "Book Antiqua", Palatino, serif;
	font-size:14px;
}
#propaganda{
	margin:25px 25px 45px 120px;
	width:740px;
	height:95px;
}
#conteudo{
	margin-right:5px;
	float:right;
	width:680px;
	background:url(imagens/laterais.gif) repeat-y;
}
#menu_vertical{
	margin-left:5px;
	float:left;
	width:300px;
	background:url(imagens/laterais_menu.gif) repeat-y;
}
#logar_alunos{
	margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	border-left:#006666 solid 5px;
	border-right:#006666 solid 5px;
	width:970px;
	background:#FFF;
	font-family:"Comic Sans MS", cursive;
	font-size:14px;
	text-align:center;
}
#logar_pais{
	margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	border-left:#CC0033 solid 5px;
	border-right:#CC0033 solid 5px;
	width:970px;
	background:#FFF;
	font-family:"Comic Sans MS", cursive;
	font-size:14px;
	text-align:center;
}
#logar_professor{
	margin:0px 10px 0px 10px;
	padding:0px 0px 0px 0px;
	border-left:#663333 solid 5px;
	border-right:#663333 solid 5px;
	width:970px;
	background:#FFF;
	font-family:"Comic Sans MS", cursive;
	font-size:14px;
	text-align:center;
}
#foto{
	font-family:"Comic Sans MS", cursive;
	font-size:14px;
	color:#333;
}

ajuda aeeee