var newWin;
var previousURL;
var previousWinName
function OpenWindow(URL,Width,Height,scrollbars,winname){
	
	if(scrollbars == "yes" || scrollbars == "1"){
	  scrollbars = "yes"
  }
  else{
	  scrollbars = "no"
  }
  
  if (!newWin || newWin.closed || winname != previousWinName){
		newWin = window.open(URL,winname,'toolbar=0,scrollbars='+scrollbars+',status=no,resizable=yes,width='+Width+',height='+Height);
			
		previousURL = URL;
		if (!newWin.opener){
			newWin.opener = window;
		}
	}
	else if(URL != previousURL){
		newWin.location.href = URL;
		newWin.focus();
		previousURL = URL;
	}
	else {
		newWin.focus();
	}
	
	previousWinName = winname
}