sfHover = function() {
	var oDrop = document.getElementById( "nav" ).getElementsByTagName( "li" );
	for (var i = 0; i < oDrop.length; i++ ) { 
		oDrop[ i ].onmouseover=function() { 
			this.className+=" over"; 
		} 
		oDrop[ i ].onmouseout=function() { 
			this.className=this.className.replace( new RegExp( " over\\b" ), "" ); 
		} 
	} 
} 
if ( document.all && document.getElementById ) window.onload=sfHover;