var popup_window = null;

function displayWindow2(url, width, height) {
     var Win = window.open(url,"displayWindow",'width=' + width + ',height=' + height + ',resizable=1,scrollbars=yes,menubar=no,top=50,left=50' );
 }

function popup(status, url, width, height) {
    if(status != 0) {
      if(popup != null) popup.focus(); 
	else { 
         var popup = open(url, "Popup", "width=" + width + ",height=" + height + ",resizable=0,scrollbars=no,menubar=no,top=50,left=50");
         popup_window = popup;
	}
      } else {
        if(popup_window != null) { popup_window.close(); }
	}								       
  }