var WindowObjectReferenceOfRequestedPopup, WindowObjectReferenceOfIntermediaryPopup;

  function OpenRequestedPopup(strUrl, strTarget)
  {
  var windowWidth, windowHeight, windowLeft, windowTop;

  if(typeof window.screenX == "number" && typeof window.innerWidth == "number")
  {
  windowWidth = window.innerWidth * .68;
  windowHeight = window.innerHeight * .68;
  windowLeft = window.screenX + window.innerWidth * .16;
  windowTop = window.screenY + window.innerHeight * .16;
  }
  else if(typeof window.screenTop == "number" && typeof document.documentElement.offsetHeight == "number")
  {
  windowWidth = document.documentElement.offsetWidth * .68;
  windowHeight = document.documentElement.offsetHeight * .68;
  windowLeft = window.screenLeft + document.documentElement.offsetWidth * .16;
  windowTop = window.screenTop - 50;
  }
  else
  {
  windowWidth = 500;
  windowHeight = 250;
  windowLeft = 60;
  windowTop = 40;
  };

  /* The above code is just to define reasonable sizes and initial positions to the popup to be. */

  if (WindowObjectReferenceOfRequestedPopup == null || WindowObjectReferenceOfRequestedPopup.closed)
  {
  WindowObjectReferenceOfRequestedPopup = window.open(strUrl, strTarget, "top=40" + ",left=40" + ",width=930,height=650" + ",menubar='no',toolbar='no',location='no',resizable='no',scrollbars='no',status='no',location='no',directories='no'");
  }
  else
  {
  WindowObjectReferenceOfRequestedPopup.location = strUrl; 
  if(WindowObjectReferenceOfRequestedPopup.focus)
    {
    WindowObjectReferenceOfRequestedPopup.focus();
    };
  };

  /*
  The above 9 lines of code creates the popup; if the popup is already opened, then it is only brought on top. This feature is possible only if the user allows it via the setting Edit/Preferences.../category:Advanced/Scripts & Plugins/Allow webpages to:/Raise or lower windows
  */
  }