$(function() {
	$('.rollover').hover(function() {
		var currentImg = $(this).attr('src');
		$(this).attr('src', $(this).attr('hover'));
		$(this).attr('hover', currentImg);
	}, function() {
		var currentImg = $(this).attr('src');
		$(this).attr('src', $(this).attr('hover'));
		$(this).attr('hover', currentImg);
	});
});

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

$.preloadImages("/images/nav-home-on.png", "/images/nav-platform-on.png", "/images/nav-tools-on.png", "/images/nav-education-on.png", "/images/nav-price-on.png", "/images/nav-about-on.png", "/images/nav-contact-on.png", "/images/nav-clients-on.png");