var WindowObjectReference = null; // global variable

function open_map()
{
	openRequestedPopup('http://dkcpc-kort.dk:8080/LSChartDisplay/map_uk.html','DKCPC','resizable=no,width=1024,height=640,status=no,location=no'); 
	return false;
}



function openRequestedPopup(strUrl, strWindowName,strFeatures)
 {
  if(WindowObjectReference == null || WindowObjectReference.closed)
  {
    WindowObjectReference = window.open(strUrl, strWindowName,strFeatures)
           //"resizable=yes,scrollbars=yes,status=yes");
  }
  else
  {
    alert("You already have one copy of the map open. Click to display this map window");
    WindowObjectReference.focus();
  };
}