if (document.images) {            
            img1on = new Image();   img1on.src = "images/homebuttdown.gif"; 
            img2on = new Image();   img2on.src = "images/designbuttdown.gif";  
            img3on = new Image();   img3on.src = "images/hostingbuttdown.gif";
            img4on = new Image();   img4on.src = "images/linksbuttdown.gif";
            img5on = new Image();   img5on.src = "images/contactbuttdown.gif";

            img1off = new Image();  img1off.src = "images/homebutt.gif";
            img2off = new Image();  img2off.src = "images/designbutt.gif";
            img3off = new Image();  img3off.src = "images/hostingbutt.gif";
            img4off = new Image();  img4off.src = "images/linksbutt.gif";
            img5off = new Image();  img5off.src = "images/contactbutt.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");        
            }
    }