function pre(imageurl){
var allurl="../image/"+imageurl+"2.gif";
 var useimage=new Array(allurl);
 for(i=0; i<useimage.length; i++){
  var allimage=new Image();
  allimage.src=useimage[i];
 }
}

function mover(item){
 var allurl="../image/"+item+"2.gif";
 document.images[item].src=allurl;
}

function mout(item){
 var allurl="../image/"+item+".gif";
 document.images[item].src=allurl;
}