var detailsWindow;

function MM_openBrWindow(theURL,winName,width,height) 
{
  var halfWidth  = (width / 2);
  var halfHeight = (height / 2);
  var winTop = (screen.height / 2) - halfHeight;
  var winLeft = (screen.width / 2) - halfWidth;
  features = "width=" + width + ",height=" + height + ",left=" + winLeft + ",top=" + winTop;
  detailsWindow = window.open(theURL,winName,features);
  detailsWindow.focus();
  return false;
}