(function($){
window.addEvent('domready',function() {
//element collection and settings
var opacity = 0.4, toOpacity = 0.9;
var linkArray = $('menu-home').getElements('a[id^=link]');
var imgArray = $('menu-img').getElements('img[id^=menu]');
imgArray.each(function(element,index) {
 element.set('opacity',opacity);
 element.addEvent('mouseenter', function() {
 element.tween('opacity',toOpacity);
 });
 element.addEvent('mouseleave', function() {
 element.tween('opacity',opacity);
 });
});
linkArray.each(function(element,index) {
 element.addEvent('mouseenter', function() {
 imgArray[index].tween('opacity',toOpacity);
 });
  element.addEvent('mouseleave', function() {
 imgArray[index].tween('opacity',opacity);
 });
});
});
})(document.id);