К главному меню не применяется стиль z-index - Вопросы по CSS

* {
	margin: 0;
	padding: 0;
}
html {
	height: 100%;
}
header, nav, section, article, aside, footer {
	display: block;
}
body {
	font: 12px/18px Arial, Tahoma, Verdana, sans-serif;
	width: 100%;
	height: 100%;
}
a {
	color: blue;
	outline: none;
	text-decoration: underline;
}
a:hover {
	text-decoration: none;
}
p {
	margin: 0 0 18px
}
img {
	border: none;
}
input {
	vertical-align: middle;
}
#wrapper {
	width: 1250px;
	margin: 0 auto;
	min-height: 100%;
	height: auto !important;
	height: 100%;
}

div.moduletable-main {
    height: 54px;
	
	padding-left: 70px;
	margin-top: -19px;
        padding-left: -30px; 
	position: relative;
}

/* Header
-----------------------------------------------------------------------------*/
#header {
	height: 350px;
	background-image: url(../images/header.png);
	background-repeat: no-repeat;
}
#logo {
    height: 337px;
	background-image: url(../images/logo.png);
	background-repeat: no-repeat;
	margin-left: 100px;
	z-index: 1;
}
#menu {
    height: 54px;
	
	padding-left: 20px;
	margin-top: -19px;
	position: relative;
}
#panel {
       height: 48px;
       background-image: url(../images/panel.png);
       background-repeat: no-repeat;  
       
       margin-top: -67px;
}	
ul.menu-gormenu {
    position:relative;
    
}
ul.menu-gormenu li {
                display: inline-block;
		height: 54px;
		margin-top: -30px;
                margin-left: -30px;
		float: left;
}

ul.menu-gormenu li.item468 a{
           background-image: url(../images/menu_5.png);
	   background-repeat: no-repeat; 
	   z-index: 6;
} 

ul.menu-gormenu li.item469 a{
           background-image: url(../images/menu_4.png);
	   background-repeat: no-repeat; 
	   z-index: 7;
} 

ul.menu-gormenu li.item470 a{
           background-image: url(../images/menu_3.png);
	   background-repeat: no-repeat; 
	   z-index: 8;
} 


ul.menu-gormenu li.item471 a{
           background-image: url(../images/menu_2.png);
	   background-repeat: no-repeat; 
	   z-index: 9;
} 

ul.menu-gormenu li.item472 a{
           background-image: url(../images/menu_1.png);
	   background-repeat: no-repeat; 
	   z-index: 10;
} 
/* Middle
-----------------------------------------------------------------------------*/
#content {
    width: 1250px;
	height: 634px;
    background-image: url(../images/fon.jpg);
	background-repeat: no-repeat;
	background-position: fixed;   
	padding: 0 0 100px;
	
}




/* Footer
-----------------------------------------------------------------------------*/
#footer {
	width: 1069px;
	margin: -100px auto 0;
	height: 48px;
	background-image: url(../images/footer.png);
    background-repeat: no-repeat;	
	position: relative;
	text-align: center;
}

ul.menu-gormenu li {
...
                margin-left: -30px;
...
}

ul.menu-gormenu li.item468 a{
...
	   z-index: 6;
}