function popupwindow(mypage,myname,w,h,scrolling)
{

if(!w)
	w = screen.width;
if(!h)
	h = screen.height;

  var win= null;
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  var settings  ='height='+h+',';
      settings +='width='+w+',';
      settings +='top='+wint+',';
      settings +='left='+winl+',';
      settings +='scrollbars='+scrolling+',';
      settings +='resizable=yes';
  win=window.open(mypage,myname,settings);


}// JavaScript Document