function menubg1a()
{
	var bttn1=document.getElementById("bttn1");
	bttn1.style.background = "url(images/plus.gif) no-repeat left top";
}

function menubg1b()
{
	var bttn1=document.getElementById("bttn1");
	bttn1.style.background = "url(images/spacer.gif) no-repeat left top";
}

function menubg2a()
{
	var bttn2=document.getElementById("bttn2");
	bttn2.style.background = "url(images/plus.gif) no-repeat left top";
}

function menubg2b()
{
	var bttn2=document.getElementById("bttn2");
	bttn2.style.background = "url(images/spacer.gif) no-repeat left top";
}

function simplePreload()

{ 
  var args = simplePreload.arguments;
  document.imageArray = new Array(args.length);
  for(var i=0; i<args.length; i++)
  {
    document.imageArray[i] = new Image;
    document.imageArray[i].src = args[i];
  }
}

preload = function() {
	simplePreload('images/button1.jpg','images/button2.jpg')
}

if (window.attachEvent) window.attachEvent("onload", preload);