if (document.images) {            
            img1on = new Image();   img1on.src = "images/but-homea.gif"; 
            img2on = new Image();   img2on.src = "images/tbut1a.gif";
            img3on = new Image();   img3on.src = "images/tbut2a.gif";  
            img4on = new Image();   img4on.src = "images/tbut3a.gif";  
            img5on = new Image();   img5on.src = "images/tbut4a.gif";
            img6on = new Image();   img6on.src = "images/tbut5a.gif";
            img7on = new Image();   img7on.src = "images/ltli-1a.gif";
            img8on = new Image();   img8on.src = "images/ltli-2a.gif";
            img9on = new Image();   img9on.src = "images/ltli-3a.gif";
			img10on = new Image();   img10on.src = "images/ltli-4a.gif";
			img11on = new Image();   img11on.src = "images/ltli-5a.gif";
			img12on = new Image();   img12on.src = "images/ltli-6a.gif";
		
            img1off = new Image();  img1off.src = "images/but-home.gif";
            img2off = new Image();  img2off.src = "images/tbut1.gif";
            img3off = new Image();  img3off.src = "images/tbut2.gif";
            img4off = new Image();  img4off.src = "images/tbut3.gif";
            img5off = new Image();  img5off.src = "images/tbut4.gif";
            img6off = new Image();  img6off.src = "images/tbut5.gif";
            img7off = new Image();  img7off.src = "images/ltli-1.gif";
            img8off = new Image();  img8off.src = "images/ltli-2.gif";
            img9off = new Image();  img9off.src = "images/ltli-3.gif";
			img10off = new Image();  img10off.src = "images/ltli-4.gif";
			img11off = new Image();  img11off.src = "images/ltli-5.gif";
			img12off = new Image();  img12off.src = "images/ltli-6.gif";
			
			
			
			
      }

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

    function imgOff(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "off.src");        
            }
    }