function MM_openBrWindow(theURL,winName,features) {
winName = "";
  window.open(theURL,"",features);
}

function centered_popup(theURL,winName,w,h,features) {
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	
	winprops = 'height='+h+',width='+w+',left='+winl+',top='+wint+','+features;
	

   MM_openBrWindow(theURL,winName,winprops);
}