var objPopupWindow = null;



function openPopup(strUrl, strWindowName, strFeatures, iWidth, iHeight)

{

  if(objPopupWindow==null || objPopupWindow.closed)

  {

    if(strFeatures==null || strFeatures.length<1)

    {

      WindowObjectReference = window.open(strUrl, strWindowName);

    }

    else

    {

      WindowObjectReference = window.open(strUrl, strWindowName,

        strFeatures, iWidth, iHeight);

    }

  }

  else

  {

    objPopupWindow.focus();

  }

}