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

		//what to do on rollover
		 $.preloadImages("images/btn-about-over.gif","images/btn-design-over.gif","images/btn-import-over.gif",
				 		 "images/btn-quality-over.gif","images/btn-sourcing-over.gif");

  });