$(document).ready(function() 
{
	
$.preloadImages = function()
{
  for(var i = 0; i<arguments.length; i++)
  {
    $("<img>").attr("src", arguments[i]);
  }
}

$.preloadImages('/images/mainnavigation/01_hover.gif', '/images/mainnavigation/02_hover.gif', '/images/mainnavigation/03_hover.gif', '/images/mainnavigation/04_hover.gif','/images/mainnavigation/05_hover.gif');

});