//Images
function PreLoad(){
  var dir = arguments[0];
  img_return = new Array();
  img_change = new Array();
  img_over = new Array();
  for(m=1,i=0; m<arguments.length; i++){
   img_return[i] = new Image;
   img_change[i] = new Image;
   img_over[i] = new Image;
   img_return[i].src = dir + arguments[m++];
   img_change[i].src = dir + arguments[m++];
   img_over[i].src = dir + arguments[m++];
  }
}
function ImgChange(n){
 document.images["img"+n].src = img_change[n-1].src;
}
function ImgReturn(n){
 document.images["img"+n].src = img_return[n-1].src;
}
function ImgOver(n){
  document.images["img"+n].src = img_over[n-1].src;
}