function Mload() {
  PreLoadFunc("M/homeH.jpg","M/mapH.jpg","M/directH.jpg","M/moreH.jpg","M/forumH.jpg")
}

function PreLoadFunc() {
  var d = document; 
  if(!d.DocImgArr) d.DocImgArr = new Array();
  var Max = d.DocImgArr.length;
  var Args = PreLoadFunc.arguments; 
  var i; 
  for(i=0; i<Args.length; i++) {
    d.DocImgArr[Max] = new Image; 
    d.DocImgArr[Max].src = Args[i];
    Max++;
  }
}

var img;
var old;

function Hover(n, i) {
  img = document.images[n];
  old = img.src;
  img.src = document.DocImgArr[i].src;
}

function Reset() {
  img.src = old;  
}