function validlogon() {
	obj_form = document.myform ;
	if(obj_form.username.value == "") {
		alert("Please enter Username");
		obj_form.username.focus();
		return false;
	}
	if(obj_form.password.value == "") {
		alert("Please enter Password");
		obj_form.password.focus();
		return false;
	}
	obj_form.datastream.value = "request:logon" ;
	obj_form.submit() ;
	return true;
}