function initCrossBrowserLib(){
  _mac=navigator.userAgent.indexOf('Mac')!=-1;
  _ie512=navigator.userAgent.indexOf('MSIE 5.12')!=-1;
  _dom=document.all?(document.getElementById?2:1):(document.getElementById?4:(document.layers?3:0));
  _createLayerNo=0;
}
initCrossBrowserLib();
//-------------------------------------------------------------------------------------------------------------------------------
function getDivImage(div,imgName){
  if(_dom==4)            return document.images[imgName];
  if(_dom==2 || _dom==1) return document.images(imgName);
  if(_dom==3)            return div.document.images[imgName];
  return null;
}
//-------------------------------------------------------------------------------------------------------------------------------
function getDivLeft(div){
  if(_dom==4 || _dom==2) return div.offsetLeft;
  if(_dom==1)            return div.style.pixelLeft;
  if(_dom==3)            return div.left;
  return 0;
}
//-------------------------------------------------------------------------------------------------------------------------------
function getDivTop(div){
  if(_dom==4 || _dom==2) return div.offsetTop;
  if(_dom==1)            return div.style.pixelTop;
  if(_dom==3)            return div.top;
  return 0;
}