addLoadListener(setNav);

function setNav()
{
	var navDiv = document.getElementById('nav');
	var navArray = navDiv.getElementsByTagName('img');
	var pattern = /\.gif/;
	var pattern2 = /-on\.gif/;
	for( var i = 0; i < navArray.length; i++ )
	{
		navArray[i].onmouseover = function(){
			this.src = this.src.replace(pattern,"-on.gif");
		}
		navArray[i].onmouseout = function(){
			this.src = this.src.replace(pattern2,".gif");
		}
	}
	return true;
}

function addLoadListener(fn)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent('onload', fn);
  }
  else
  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = fn;
    }
    else
    {
      window.onload = function()
      {
        oldfn();
        fn();
      };
    }
  }
}