// JavaScript Document
var currId = 'div_1';
//
function show_div(div_id) {  
    if(currId) 
    document.getElementById(currId).style.display = 'none'; 
    document.getElementById(div_id).style.display = 'block'; 
    currId = div_id; 
}

function simplePreload()
{ 
  var args = simplePreload.arguments;
  document.imageArray = new Array(args.length);
  for(var i=0; i<args.length; i++)
  {
    document.imageArray[i] = new Image;
    document.imageArray[i].src = args[i];
  }
}
function imSwap(im){im.src=(im.src.indexOf('off')>0)?im.src.replace(/off/,'on'):im.src.replace(/on/,'off');}