function swap_img_src(img_name, img_source) {

      	var browserType = 0;
      
      	if (navigator.appName == "Microsoft Internet Explorer") browserType = 1;
      	else browserType = 2;

        if (browserType == 1) {
         
            document.images[img_name].src = img_source;
               
        } else {
               
			document[img_name].src = img_source;
               
    	}
         
    }