function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			if (oldonload) oldonload();
			func();
		}
	}
}

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

addLoadEvent( initNavigation );