var imageDir = "images/";
	
	 // preload navbar images
	 bus_resources_on = new Image();
	 bus_resources_on.src = imageDir + "bus_resources_c_over.jpg";
	 bus_resources_off = new Image();
	 bus_resources_off.src = imageDir + "bus_resources_c.jpg";
	  
	 career_on = new Image();
	 career_on.src = imageDir + "career_c_over.jpg";
	 career_off = new Image();
	 career_off.src = imageDir + "career_c.jpg";
	  
	 youth_on = new Image();
	 youth_on.src = imageDir + "youth_c_over.jpg";
	 youth_off = new Image();
	 youth_off.src = imageDir + "youth_c.jpg";
	  
	 whatsnew_on = new Image();
	 whatsnew_on.src = imageDir + "whatsnew_c_over.jpg";
	 whatsnew_off = new Image();
	 whatsnew_off.src = imageDir + "whatsnew_c.jpg";
	  
	 jobs_on = new Image();
	 jobs_on.src = imageDir + "jobs_c_over.jpg";
	 jobs_off = new Image();
	 jobs_off.src = imageDir + "jobs_c.jpg";
	 
	 aboutus_on = new Image();
	 aboutus_on.src = imageDir + "aboutus_c_over.jpg";
	 aboutus_off = new Image();
	 aboutus_off.src = imageDir + "aboutus_c.jpg";
	 
	 brac_on = new Image();
	 brac_on.src = imageDir + "brac_c_over.jpg";
	 brac_off = new Image();
	 brac_off.src = imageDir + "brac_c.jpg";
	 
	 links_on = new Image();
	 links_on.src = imageDir + "links_c_over.jpg";
	 links_off = new Image();
	 links_off.src = imageDir + "links_c.jpg";
	 
	 contact_on = new Image();
	 contact_on.src = imageDir + "contact_c_over.jpg";
	 contact_off = new Image();
	 contact_off.src = imageDir + "contact_c.jpg";
	 
	 function topMenuSwap(image, state) {
		var thisImage = document.getElementById(image);
		thisImage.src = eval(image + "_" + state + ".src");
		return;
	 }