function isExplorer() {
  if ((navigator.appName=="Microsoft Internet Explorer") && (parseInt(navigator.appVersion)>=4)) {
	  return true;
  } else
	if (navigator.appName == "Netscape") {
	  return false;
  } else {
	  return false;
	}
}
function PopUpForm(myform, windowname) {
	if (!window.focus)return true;
	window.open('', windowname, 'height=200,width=400,scrollbars=yes');
	myform.target=windowname;
	return true;
}