function activateMenu() {

	var menu = document.getElementById('mainMenu');
	
	for(var i=0;i<menu.childNodes.length;i++) {
		var child=menu.childNodes[i];
		if (child.tagName=='LI') {
			
			if (child.className != 'hover') {
				// attach events
				child.onmouseover = function() {
					this.className = 'hover';
				};
				child.onmouseout = function() {
					this.className = '';
				}
			}
			
			// set background of link to image contained in link
			// hide image
			for(var j=0;j<child.childNodes.length;j++) {
				var link = child.childNodes[j];
				if (link.tagName == 'A') {
					
					for (var k=0;k<link.childNodes.length;k++) {
						var img = link.childNodes[k];
						if (img.tagName == 'IMG') {
							// image found.
							img.style.visibility='hidden';
							
							var div = document.createElement('DIV');
							div.className = 'insertedForBG';
							div.style.backgroundImage = "url("+ img.src + ")";
							
							div.style.width = img.width;
							
							link.insertBefore(div,img);
							div.appendChild(img);
							break;
						}
					}
					
				}
			}	
			
			
		}
			
	}

}

window.onload = function() {
	activateMenu();	
}