if (document.images)

{
    button1dark = new Image;
    button1light = new Image;
		button2dark = new Image;
		button2light = new Image;
		button3dark = new Image;
		button3light = new Image;
		button4dark = new Image;
		button4light = new Image;
				
		
		button1dark.src = "images/home1.jpg";
		button1light.src = "images/home2.jpg";
    button2dark.src = "images/services1.jpg";
    button2light.src = "images/services2.jpg";
    button3dark.src = "images/products1.jpg";
    button3light.src = "images/products2.jpg";
    button4dark.src = "images/contact1.jpg";
    button4light.src = "images/contact2.jpg";
       

}
else {
      button1dark = ""
			button1light = ""
      button2dark = ""
			button2light = ""
			button3dark = ""
			button3light = ""
			button4dark = ""
			button4light = ""
			
			
			
			document.button1 = ""
			document.button2 = ""
			document.button3 = ""
			document.button4 = ""
						
			}