function contact_us() {
	var form = document.contactUsForm;
	
	if (form.firstName.value == '' || form.firstName.value.length == 0) {
		alert("Please input your first name");
		return;
	}
	if (form.lastName.value == '' || form.lastName.value.length == 0) {
		alert("Please input your last name");
		return;
	}
	if (echeck(form.email.value)==false) {
		alert("Please enter a valid email address");
		return;
	}
	var gender = getButtonValue(form.gender);
	if(gender == null) {
		alert("Please select your gender");
		return;
	}
	if(form.ageGroup.value == '' || form.ageGroup.value.length == 0) {
		alert("Please select your age group");
		return;
	}
	if(form.country.value == '' || form.country.value.length == 0) {
		alert("Please input your country of origin");
		return;
	}
	

	form.submit();
}