Css IE, Firefox sorunu

/* sayfa ozellikleri */

body {
	background: #575d60
	font: normal small Times New Roman, Arial;
	color: #959595;
	text-align: center;
}
#container {width: 760px; height: 1000px; margin: 0 auto; text-align: left;  }
#Header { position: relative;
background-image: url(images/default_02.gif);
backround-repeat:repeat-x;

}

/* baslik alani*/

#header .logo{ width: 279px; height: 153px; position: relative;
background-image: url(images/default_01.gif);
 }
 
#header .menu
{width: 700px; height: 100px
  float: left;
	margin:0 0 0 0;
	background-image: url(images/img12.gif); repeat-y;
		text-align: center;
}

#header .menu ul 
{
	margin: 0 0 0 150;
	padding: 0;
	white-space : nowrap;
		text-align: center;
}

#header .menu ul li 
{
	margin: 0;
	padding: 0;
	display: block;
	float:left;
	text-align: center;
}

#header .menu ul li a 
{
	color : #fff;
	text-decoration : none;
	font-weight: bold;
	display: block;
	border-style:none;
}

#header .menu ul li a:link, #header .menu ul li a:visited 
{
	background-image: url(images/menu_item2.gif);
	background-repeat: no-repeat;
	height: 26px;
	width: 94px;
	line-height: 26px;
	padding-top: 7px;
}

#header .menu ul li a:hover, #header .menu ul li a:active 
{
	background-image: url(images/menu_item2.gif);
	background-repeat: no-repeat;
	background-position: 0px -33px;
	height: 29px;
	width: 94px;
	line-height: 29px;
	padding-top: 4px;
}

#header .menu ul li.active a:hover, #header .menu ul li.active a:active, #header .menu ul li.active a:link, #header .menu.ic ul li.active a:visited 
{
	background-image: url(images/menu_item2.gif);
	background-repeat: no-repeat;
	background-position: 0px -66px;
	height: 29px;
	width: 94px;
	line-height: 29px;
	padding-top: 4px;
	color: #B05128;
}
#header .menualt { 
 	width: 770px; height: 60px
  float: center;
	margin:0 0 0 0;
	background-image: url(images/img16.gif); repeat-y;
}
 
 /* icerik alani*/

#icerik { width: 500px; height: 600px; display: block; float: left;
 }
 
 /*menuler*/
#icerik .menu {
width: 472px; height: 201px;
margin: 15px 15px 0px auto;
position: relative;
float: left;
}
#icerik .menu .ust {
width: 472px; height: 35px;
background-image: url(images/img14.gif);
position: relative;
float: left;
}
#icerik .menu .alt {
width: 472px; height: 166px;
background-image: url(images/overlay.gif);
position: relative;
float: left;
}
#icerik .menu1 {
width: 223px; height: 195px;
margin: 15px 25px 0px auto;
position: relative;
float: left;
}
#icerik .menu1 .ust {
width:223px; height: 35px;
background-image: url(images/img14.gif);
position: relative;
float: left;
}
#icerik .menu1 .alt {
width: 223px; height: 160px;
background-image: url(images/overlay.gif);
position: relative;
float: left;
}


/* yan menu */
#yan {
float: right;

}


#yan .baslik{
width: 260 px; height: 35;
margin: 15px 0 0 0;
background-image: url(images/img12.gif); repeat-y;
float: right;
}
#yan .uye{
width: 260 px; height: 35;
margin: 15px 0 0 0;
background-image: url(images/img14.gif); repeat-y;
float: right;
}
#yan .menu {
width: 260 px; height: 100;
background-image: url(images/img16.gif);
float: right;
}

#alt {
width: 770px; height: 35px;
background-image: url(images/img14.gif); repeat-y;
margin: 15px 0 0 0;
}
#alt {
width: 770px; height: 42px;
background-image: url(images/img13.gif); repeat-y;
margin: 15 0 0 0;
}
#alt .ust{
width: 770px; height: 35px;
background-image: url(images/img14.gif); repeat-y;
margin:0;
}