window.onload = function() {
	var menuDivs = new Array('mainmenu', 'submenu');
	
	for (n = 0; n < menuDivs.length; n++) {
		var menu = document.getElementById(menuDivs[n]); 
		if (menu) {
			var menuUL = menu.childNodes[0];
			for (m = 0; m < menuUL.childNodes.length; m++) {
				var menuLI = menuUL.childNodes[m];
				if (menuLI.nodeName == 'LI') {
					menuLI.onmouseover = function() {
						this.className += ' over';
					}
					menuLI.onmouseout = function() {
						this.className = this.className.replace(' over', '');
					}
				}
			}			
		}
	}
}