W3C CSS Validator!!

[Mikmoro]

Bueno, no tanto.

Este es tu código sin errores ni advertencias. Comprueba que no haya cambiado algo que afecte al diseño y no pudieras corregir.

body{margin:0px; background:#336699 url(../images/bg_page.jpg) fixed; font: 12px Verdana, Arial, Helvetica, sans-serif;}
h1,h2,h3,p,form,ul{margin:0px; padding:0px; font-weight:normal;}
h1{font-size:24px; padding:4px;}
h2{font-size:20px; padding:4px; letter-spacing:-1px;}
h3{font-size:18px; padding:4px;}

#MainFrame{position:relative;margin:20px auto 20px auto; text-align:center; width:900px;}
#Container{text-align:left; width:100%;}
#Content{width:100%;background-color:#FFF;}

#Header{
position:relative;
width:100%;
height:90px;
background:#09C url(../images/header_bg.jpg);
}

#NavMenu{
position:relative;
width:900px;
padding-top:6px;
padding-bottom:6px;
background:#369 url(../images/bg_nav.jpg);
color:#FFF;
display:block; overflow:hidden;
}
#NavMenu ul{font: 12px Verdana, Arial, Helvetica, sans-serif;}
#NavMenu ul li{float:left; list-style:none; margin-right:1px;}
#NavMenu ul li .Suche{padding-left:120px; position:absolute; top:5px;}
#NavMenu ul li a{
display:block;
padding:4px 14px 4px 14px;
text-decoration:none;
font-weight:bold;
color:#FFF;
background-color:#369;
}
#NavMenu ul li a:hover{color:#9FF;}
#NavMenu ul li a.selected,#NavMenu ul li a.selected:hover{ background-color:#369;
color:#FFC;}

#WebContents{
position:relative; padding:4px 2px 2px 2px;
}

#Div1{position:relative; width:200px; float:left;}
#Div2{position:relative; background-color:#FFF; width:540px; float:left; left:6px;}
#Div3{position:relative; width:136px; float:right; right:2px;}

#Credits,#Footer{padding:10px 20px; font-size:10px;}
#Footer{background-color:#999; border-top:1px solid #000;}
#Footer label{display:block; text-align:right;}
#Credits{background-color:#666;}
#Buscador{margin-bottom:4px;}
#Buscador h3{background-color:#FFF;}

#Inmuebles, #Servicios{
background:#F2E3C9 url(../images/bg_lupa.gif) bottom right no-repeat; padding:6px 2px 3px 6px; position:relative; top:0px; left:0px; border:1px solid #960; border-top:0px;
}
.corte{clear:both;}
.seccion, .ex{margin-bottom:4px;}
.ex{background-color:#EFEFEF; padding:2px;}
.clasi{border-bottom:1px solid #666;}
.FormElem, .BsF, .codigo{
border-bottom:1px solid #DFE6EC;
border-right:1px solid #DFE6EC;
border-left:1px solid #666;
border-top:1px solid #666;
padding:2px;
font:11px Verdana, Arial, Helvetica, sans-serif;
}
.BsF{width:65px;}
.codigo{width:100px;}

.destacados, .resaltar{
padding:4px; display:block; margin-bottom:4px;
}
#Div2 ul{margin:0px; padding:0px;}
#Div2 ul li{float:left; width:135px; list-style:none; margin:0px; padding:0px; font-size:10px;}
.precio1, .precio2{color:#F00;}
.precio2{font:bold 16px Verdana, Arial, Helvetica, sans-serif;}

.destacados h3 a{color:#36C;}
.destacados h3 a:hover{color:#0CF;}
.resaltar{border-top:1px dashed #887437; border-bottom:1px dashed #887437; background:#FFC url(../images/bg_star.gif) bottom right no-repeat;}
.resaltar h3 a{color:#D00;}
.resaltar h3 a:hover{color:#F00;}

.txt10px{font-size:10px;}

#Buscador ul{margin:0; padding:0; padding-left:0px;}
#Buscador ul li{display:block; float:left; margin-left:0px; list-style:none;}
#Buscador ul li a{color:#FFF; padding:6px 6px 6px 0px; background: #666 url(../images/gray_rgt.gif) top right no-repeat; text-decoration:none; font-weight:bold; outline:0; display:block;}
#Buscador ul li a:hover{background:#C30 url(../images/red_rgt.gif) top right no-repeat;}
#Buscador ul li a span{padding:6px 6px 9px; background:url(../images/gray_lft.gif) top left no-repeat;}
#Buscador ul li a:hover span{background:#C30 url(../images/red_lft.gif) top left no-repeat;}
#Buscador ul li a.current,#Buscador ul li a:hover.current{color:#333; background:#9C0 url(../images/green_rgt.gif) top right no-repeat;}
#Buscador ul li a.current span,#nv_menu ul li a:hover.current span{background:#9C0 url(../images/green_lft.gif) top left no-repeat;}

#Buscador .txt11{font:12px Arial, Helvetica, sans-serif; color:#667;}
#Buscador label{font:bold 11px Verdana, Arial, Helvetica, sans-serif; display:block; padding:4px 0px 2px 0px; color:#887437; }

Mikel.