function showhelp(mypage,myname,w,h,scroll) {
	LeftPosition=(screen.width)?(screen.width-w)/2:100;
      TopPosition=(screen.height)?(screen.height-h)/2:100;

	settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
	win=window.open(mypage,myname,settings);
}