function login()
{
	var UA = navigator.appName
	var ver = navigator.appVersion
	var tempUA = "" ;
	
	if( navigator.appName=="Netscape" ) {
      tempUA	=	navigator.appName;
      ver		=	1 ; 
	 }
	 
	if(UA.indexOf("Microsoft") != -1) {
		tempUA =  "Microsoft" ; 
		ver = ver.split(";")[1].split(" ")[2];
	}

	if( tempUA != "Microsoft" || ver < 5.5 ) {
		 tmp = 	 "We detected a web browser version that does not support the following web application.\n" ;
		 tmp = tmp + "RB Web supports Internet Explorer 5.5 or higher.\n" ;
		 tmp = tmp + "Please update your Internet Explorer to the latest version and try again.\n";
	     alert(tmp) ;
		 return; 
	 }
	 	
	if(Trim(document.frmlogin.userid.value) == '')
	{
		alert("User id is required.");
		document.frmlogin.userid.focus();
		return;
	}
	
	if(document.frmlogin.password.value == '')
	{
		alert("Password is required.");
		document.frmlogin.password.focus();
		return;
	}

	document.frmlogin.submit();
}