var imageDir = "images/";
	
	 // preload navbar images
	 connect_on = new Image();
	 connect_on.src = imageDir + "connect_on.jpg";
	 connect_off = new Image();
	 connect_off.src = imageDir + "connect_off.jpg";
	  
	 read_on = new Image();
	 read_on.src = imageDir + "read_on.jpg";
	 read_off = new Image();
	 read_off.src = imageDir + "read_off.jpg";
	  
	 wise_on = new Image();
	 wise_on.src = imageDir + "wise_on.jpg";
	 wise_off = new Image();
	 wise_off.src = imageDir + "wise_off.jpg";
	  
	 lighten_on = new Image();
	 lighten_on.src = imageDir + "lighten_on.jpg";
	 lighten_off = new Image();
	 lighten_off.src = imageDir + "lighten_off.jpg";
	  
	 share_on = new Image();
	 share_on.src = imageDir + "share_on.jpg";
	 share_off = new Image();
	 share_off.src = imageDir + "share_off.jpg";
	 
	 search_on = new Image();
	 search_on.src = imageDir + "search_on.jpg";
	 search_off = new Image();
	 search_off.src = imageDir + "search_off.jpg";
	 
	 
	 function topMenuSwap(image, state) {
		var thisImage = document.getElementById(image);
		thisImage.src = eval(image + "_" + state + ".src");
		return;
	 }