function imOn(pref,i) { 
  if(document.images) document.images[pref + i].src=ccover.src;
 }
 function imOff(pref,i) {
  if(document.images) document.images[pref + i].src=ccout.src;
 }

 function menuOn(name,img) {
  icover=new Image;
  icover.src="image/"+img+".gif"
  if(document.images) document.images[name].src=icover.src;
 }
 function menuOff(name,img) {
  icout=new Image;
  icout.src="image/"+img+".gif";
  if(document.images) document.images[name].src=icout.src;
 }