#nav{   
    position: absolute;
    left: 450px;
    top:-130px;
    width: 600px;
    height:150px;
    z-index:100;clear:none;
}
  	#adt{position: absolute; left:520px; top:10px;}
  
.home a{
    display: block;
    width: 90px;
    padding: 100px 15px 45px 0px;
    background: url(images/icon-home.png) 0 0 no-repeat;
    text-decoration: none;
    text-align:center;
    float: left;
    }
.home a:hover 
    { 
    background-position: 0 -163px;
    }
    
.services a{
    display: block;
    width: 90px;
    padding: 100px 15px 45px 0px;
    background: url(images/icon-services.png) 0 0 no-repeat;
    text-decoration: none;
    text-align:center;
    float: left;
    }
.services a:hover { 
    background-position: 0 -163px;
    }
.products a{
    display: block;
    width: 90px;
    padding: 100px 15px 45px 0px;
    background: url(images/icon-products.png) 0 0 no-repeat;
    text-decoration: none;
    text-align:center;
    float: left;
    }
.products a:hover { 
    background-position: 0 -163px;
    }
.aboutus a{
    display: block;
    width: 90px;
    padding: 100px 15px 45px 0px;
    background: url(images/icon-aboutus.png) 0 0 no-repeat;
    text-decoration: none;
    text-align:center;
    float: left;
    }
.aboutus a:hover { 
    background-position: 0 -163px;
    }
.contactus a{
    display: block;
    width: 90px;
    padding: 100px 15px 45px 0px;
    background: url(images/icon-contact.png) 0 0 no-repeat;
    text-decoration: none;
    text-align:center;
    float: left;
    }
.contactus a:hover { 
    background-position: 0 -163px;
    }