if (document.images)
{
  preload_image = new Image(); 
  preload_image.src="images/menuHomeIconGray.png"; 
  preload_image2 = new Image(); 
  preload_image2.src="images/menuHomeIconColor.png"; 
  preload_image3 = new Image(); 
  preload_image3.src="images/menuPortfolioIconGray.png"; 
  preload_image4 = new Image(); 
  preload_image4.src="images/menuPortfolioIconColor.png";
  preload_image5 = new Image(); 
  preload_image5.src="images/menuAboutIconGray.png";		  
  preload_image6 = new Image(); 
  preload_image6.src="images/menuAboutIconColor.png";
  preload_image7 = new Image(); 
  preload_image7.src="images/menuContactIconGray.png";
  preload_image8 = new Image(); 
  preload_image8.src="images/menuContactIconColor.png";  
}