function popup(url, name, width, height){
  var settings; 
  var childWin;
  LeftPosition = (screen.width) ? (screen.width-width)/2 : 0;
  TopPosition = (screen.height) ? (screen.height-height)/2 : 0;
  settings = "toolbar=no,location=no,directories=no,status=no, " +
	"menubar=no,scrollbars=yes,resizable=yes,width=" + width + ",height=" + height +
	",left=" + LeftPosition + ",top=" + TopPosition;
  childWin = MyNewWindow=window.open(url,name,settings);
  childWin.focus();
} 

function customPopup(url, name, attrb){
  MyNewWindow=window.open(url,name,attrb);
}