//server location
	var site_root = '/courses/teachingmath/';
	
	//=======================================================
	
	// use this for rollover images on homepage
	
		img1on = new Image();           // Rollover images
		img1on.src = site_root + "images/hm_c01_ovr.jpg";  
		img2on = new Image(); 
		img2on.src = site_root + "images/hm_c02_ovr.jpg";  
		img3on = new Image(); 
		img3on.src = site_root + "images/hm_c03_ovr.jpg";  
		img4on = new Image(); 
		img4on.src = site_root + "images/hm_c04_ovr.jpg";  
	
		img1off = new Image();          // Rolloff images
		img1off.src = site_root + "images/hm_c01_off.jpg"; 
		img2off = new Image();
		img2off.src = site_root + "images/hm_c02_off.jpg";  
		img3off = new Image();
		img3off.src = site_root + "images/hm_c03_off.jpg";  
		img4off = new Image();
		img4off.src = site_root + "images/hm_c04_off.jpg";  
			
		

		function imgOn(imgName) {
		        if (document.images) {
		            document[imgName].src = eval(imgName + "on.src");
		            //document["display"].src = eval(imgName + "_display.src");
		            //document["display2"].src = eval(imgName + "_display2.src");
		        }
		}

		function imgOff(imgName) {
		        if (document.images) {
		            document[imgName].src = eval(imgName + "off.src");
		            //document["display"].src = location + "images/spacer.gif";  
		            //document["display2"].src = location + "images/spacer.gif"; 
		        }
		}

//=======================================================