function validate(form)
{
	if (is_empty(form.name))
	{
		alert("Please enter your name.");
		form.name.focus();
		return false;
	}
	if (is_empty(form.email))
	{
		alert("Please enter your email address.");
		form.email.focus();
		return false;
	}
	if (!valid_email(form.email))
	{
		alert("Please enter a valid email address.");
		form.email.focus();
		return false;
	}
	if (is_empty(form.subject))
	{
		alert("Please enter a subject.");
		form.subject.focus();
		return false;
	}
	if (is_empty(form.message))
	{
		alert("Please enter a message.");
		form.message.focus();
		return false;
	}
	if (is_empty(form.captcha))
	{
		alert("Please enter the validation code.");
		form.captcha.focus();
		return false;
	}
	if (form.captcha.value.length != 4)
	{
		alert("Please enter a valid validation code.");
		form.captcha.focus();
		return false;
	}

	return true;
}

function survey_validate(form)
{
	if (is_empty(form.name))
	{
		alert("Please enter your name.");
		form.name.focus();
		return false;
	}
	if (is_empty(form.email))
	{
		alert("Please enter your email address.");
		form.email.focus();
		return false;
	}
	if (!valid_email(form.email))
	{
		alert("Please enter a valid email address.");
		form.email.focus();
		return false;
	}
	if (is_empty(form.captcha))
	{
		alert("Please enter the validation code.");
		form.captcha.focus();
		return false;
	}
	if (form.captcha.value.length != 4)
	{
		alert("Please enter a valid validation code.");
		form.captcha.focus();
		return false;
	}
	if (!form.Q1[0].checked && !form.Q1[1].checked && !form.Q1[2].checked)
	{
		alert("Please select a rating for Question 1.");
		return false;
	}
	if (!form.Q2[0].checked && !form.Q2[1].checked && !form.Q2[2].checked)
	{
		alert("Please select a rating for Question 2.");
		return false;
	}
	if (!form.Q3[0].checked && !form.Q3[1].checked && !form.Q3[2].checked)
	{
		alert("Please select a rating for Question 3.");
		return false;
	}
	if (!form.Q4[0].checked && !form.Q4[1].checked && !form.Q4[2].checked)
	{
		alert("Please select a rating for Question 4.");
		return false;
	}
	if (!form.Q5[0].checked && !form.Q5[1].checked && !form.Q5[2].checked)
	{
		alert("Please select a rating for Question 5.");
		return false;
	}
	if (!form.Q6[0].checked && !form.Q6[1].checked && !form.Q6[2].checked)
	{
		alert("Please select a rating for Question 6.");
		return false;
	}

	return true;
}

function login_validate(form)
{
	if (is_empty(form.username))
	{
		alert("Please enter a username.");
		form.username.focus();
		return false;
	}
	if (is_empty(form.password))
	{
		alert("Please enter a password.");
		form.password.focus();
		return false;
	}

	form.password.value = hex_md5(form.password.value);

	return true;
}

function is_empty(obj)
{
	return (obj.value == "" || obj.value == 0) 
}

function valid_email(obj)
{
	var emailReg = "^[\\w-_\.]*[\\w-_\.]\@[\\w]\.+[\\w]+[\\w]$";
	var regex    = new RegExp(emailReg);

	return regex.test(obj.value);
}