function check_frm() {
	var frm = document.forms.sub_frm;
	var sys_message = '';

	var firstname = frm.firstname.value;
	var lastname = frm.lastname.value;
	var email = frm.email.value;
	var comments = frm.comments.value;
	
	var re_email = /^[-a-z0-9_\.]+@{1}[-a-z0-9_\.]+\.{1}[-a-z0-9_\.]+$/i;

	if (!firstname && !sys_message) {
		sys_message = 'Please enter your First Name';
		frm.firstname.focus();
	}

	if (!lastname && !sys_message) {
		sys_message = 'Please enter your Last Name';
		frm.lastname.focus();
	}

	if (!email.match(re_email) && sys_message == '') {
		sys_message = 'Please enter correct E-mail Address';
		frm.email.focus();
	}

	if (comments == '' && sys_message == '') {
		sys_message = 'Please enter your comments';
		frm.comments.focus();
	}

	if (sys_message == '') {
		frm.submit();
	} else {
		alert (sys_message);
	}
}