if (document.images) { 
img1on = new Image();
img1on.src = "images/cata2.gif"; 
img1off = new Image(); 
img1off.src = "images/cata1.gif"; 

img2on = new Image();
img2on.src = "images/catb2.gif"; 
img2off = new Image(); 
img2off.src = "images/catb1.gif"; 

img3on = new Image();
img3on.src = "images/catc2.gif"; 
img3off = new Image(); 
img3off.src = "images/catc1.gif"; 

img4on = new Image();
img4on.src = "images/catd2.gif"; 
img4off = new Image(); 
img4off.src = "images/catd1.gif"; 


img5on = new Image();
img5on.src = "images/logomouse.png"; 
img5off = new Image(); 
img5off.src = "images/logo.png";

img11on = new Image();
img11on.src = "images/cata2.gif"; 
img11off = new Image(); 
img11off.src = "images/cata1.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");}
}