function validate_signup_form(){
	var email = document.forms.nav_signup_form.email.value;
	var fullname = document.forms.nav_signup_form.fullname.value;
	var captcha_text = document.forms.nav_signup_form.captcha_text.value;
	var error = '';
	
	if (fullname == '')
	{
		error = error + 'Please enter your full name to signup\n';
	}
	
	if (email == '' || email == "Email Address" ) {
		error = error + 'Please enter your email address to sign up\n';
	} else if (email.match('@') == null) {
		error = error + 'Please make sure the email address you have entered is valid\n';
	}

	if (captcha_text == '')
	{
		error = error + 'Please enter the text in the image below to signup\n';
	}
	
	if (error) {
		alert (error);
		return false;
	} else {
		return true;
	}
}