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");
        }}
if (document.images) {       //if image object is available, assign mouseover images     
img1on = new Image();		
img1on.src = "images/image1on.jpg"; 
img2on = new Image();
img2on.src = "images/image2on.jpg";  
img3on = new Image();
img3on.src = "images/image3on.jpg";
img4on = new Image();
img4on.src = "images/image4on.jpg";
img1off = new Image();		  	// mouseout images
img1off.src = "images/image1off.png"; 
img2off = new Image();          
img2off.src = "images/image2off.png";
img3off = new Image();
img3off.src = "images/image3off.png";
img4off = new Image();
img4off.src = "images/image4off.png";
}
if (document.layers)
    var doc = 'document.', vis = '.visibility';
if (document.all)
   var doc = 'document.all.', vis = '.style.visibility';
function show(object) {
    if (document.layers || document.all)
        eval(doc + object + vis + ' = "visible"');
}
function hide(object) {
    if (document.layers || document.all)
        eval(doc + object + vis + ' = "hidden"');
}
function hideAll() {
    hide('v1');
    hide('v2');
		hide('v3');
		hide('v4');
}
function on(i) { document.getElementById(i).className="show"; }
function off(i){ document.getElementById(i).className="hidey"; }
function fade(i){ document.getElementById(i).className="faint"; }