function CheckEmail(email) {
	if ( (email.indexOf(' ') != -1) || (email.indexOf('@', 1) == -1) ) {
		return false;
	}

	emailDomain = email.substr(email.indexOf('@') + 1);
		
	if ( (emailDomain.length < 4) || (emailDomain.indexOf('.', 1) == -1) ) {
		return false;
	}

	emailEnding = emailDomain.substr(emailDomain.indexOf('.') + 1);

	if (emailEnding.length < 2) {
		return false;
	}

	return true;
}

function loginForm_onsubmit() {
	if (document.loginForm.email.value == "") {
		alert("Please enter your e-mail address.");
		document.loginForm.email.focus();
		return false;

	}
    
    if (!CheckEmail(document.loginForm.email.value)) {
		alert("Please enter correct e-mail address.");
		document.loginForm.email.focus();
		return false;
	}

	if (document.loginForm.password.value == "") {
		alert("Please enter your passowrd.");
		document.loginForm.password.focus();
		return false;
	}

	return true;
}