var iPath = 'images/';
var bExt = 'gif';
var iExt = 'jpg';
var suffix = new Array('on', 'off');

function preLoadbtn()
{
  if(document.images)
  {
    var argLen = arguments.length;
    for(var i = 0; i < argLen; i++)
    {
      var arg = arguments[i];
      var sufLen = suffix.length;
      for(j = 0; j < sufLen; j++)
      {
        var suf = suffix[j]
        self[arg + '_' + suf] = new Image();
        self[arg + '_' + suf].src = iPath + arg + '_' + suf + '.' + bExt;
      }
    }
  }
}

function preLoadimg()
{
  if(document.images)
  {
    var argLen = arguments.length;
    for(var i = 0; i < argLen; i++)
    {
      var arg = arguments[i];
      self[arg] = new Image();
      self[arg].src = iPath + arg + '.' + iExt;
    }
  }
}


function change1(bName, bState, iName, iState)
 {
  if (document.images && self[bName + '_' + bState])
     {
	document.images[bName].src = self[bName + '_' + bState].src;
	document.images[iName].src = self[iState].src;
	}
 }