// add following to the page
// <input id='imageOffsetLeft' name='imageOffsetLeft' type='hidden' value='0'/>
// <input id='imageOffsetTop' name='imageOffsetTop' type='hidden' value='0'/>

function setMapImageOffset(left, top){
   // alert('mapimageoffset '+left);
  if(document.getElementById('imageOffsetLeft')){
    document.getElementById('imageOffsetLeft').value=left;
  }else{alert('imageOffsetLeft not defined');}
  if(document.getElementById('imageOffsetTop')){
    document.getElementById('imageOffsetTop').value=top;
  }else{alert('imageOffsetRight not defined');}
}


function getMapImageOffsetLeft(){
  var rc=0;
  if(document.getElementById('imageOffsetLeft')){
    rc=  parseInt(document.getElementById('imageOffsetLeft').value);
  }
  return rc;
}
function getMapImageOffsetTop(){
  var rc=0;
  if(document.getElementById('imageOffsetTop')){
    rc=  parseInt(document.getElementById('imageOffsetTop').value);
  }
  return rc;
}