/***********************************************
* Drop Down/ Overlapping Content- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for legal use.
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/
function getposOffset(overlay,offsettype){
  var totaloffset=(offsettype=="left")?overlay.offsetLeft:overlay.offsetTop;
  var parentEl=overlay.offsetParent;
  while(parentEl!=null){
    totaloffset=(offsettype=="left")?totaloffset+parentEl.offsetLeft:totaloffset+parentEl.offsetTop;
    parentEl=parentEl.offsetParent;
  }
  return totaloffset;
}

function overlay(curobj,subobjstr,opt_position){
  if(document.getElementById){
    var subobj=document.getElementById(subobjstr)
    subobj.style.display=(subobj.style.display!="block")?"block":"none"
    var xpos=getposOffset(curobj,"left")+((typeof opt_position!="undefined" && opt_position.indexOf("right")!=-1)?-(subobj.offsetWidth-curobj.offsetWidth):0) 
    var ypos=getposOffset(curobj,"top")+((typeof opt_position!="undefined" && opt_position.indexOf("bottom")!=-1)?curobj.offsetHeight:0)
    subobj.style.left=xpos-162+"px"
    subobj.style.top=ypos-1+"px"
    return false
  }else
  return true
}

function overlayclose(subobj){
  document.getElementById(subobj).style.display="none"
}