function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

MainMenu = Class.create();
MainMenu.prototype = {
	initialize: function()
	{
		var overBound =  this.onMouseOver.bindAsEventListener(this);
		var outBound =  this.onMouseOut.bindAsEventListener(this);
		var preloads = [];

		var items = $('menu').getElementsBySelector('a');
		for (var i = 0; i < items.length; i++)
		{
			var active = items[i].getAttribute('a');

			if (!active)
			{
				items[i].observe('mouseover', overBound);
				items[i].observe('mouseout', outBound);
			}

			//brealod background
			var preload = new Image();
			preload.src = items[i].getAttribute('bg');
			items[i].setAttribute('bg', preload.src);
			preloads.push(preload);

			//preload hover background
			var preload = new Image();
			preload.src = items[i].getAttribute('bghover');
			items[i].setAttribute('bghover', preload.src);
			preloads.push(preload);

			//set background
			if (!active)
				items[i].style.backgroundImage = 'url("'+items[i].getAttribute('bg')+'")';
			else
				items[i].style.backgroundImage = 'url("'+items[i].getAttribute('bghover')+'")';
		}
	},

	onMouseOver: function(event)
	{
		var e = Event.element(event);
		e.style.backgroundImage = 'url("'+e.getAttribute('bghover')+'")';
	},

	onMouseOut: function(event)
	{
		var e = Event.element(event);
		e.style.backgroundImage = 'url("'+e.getAttribute('bg')+'")';
	}
};