if (document.images) rollover = "yes";
     else rollover = "no";

if (rollover == "yes") {
     img1on = new Image();
     img2on = new Image();
    
    


     img1off = new Image();
     img2off = new Image();
     
  

     img1on.src = "img/skip_on.gif";
     img2on.src = "img/again_on.gif";
  


     img1off.src = "img/skip_b.gif";
     img2off.src = "img/again_b.gif";
 
   
}

function imageSwitchOn(imageName) {
     if (rollover == "yes") {
          imageOn = eval(imageName + 'on.src');
          document [imageName].src = imageOn;
     }
}

function imageSwitchOff(imageName) {
     if (rollover == "yes") {
          imageOff = eval(imageName + 'off.src');
          document [imageName].src = imageOff;
     }
}