function checkContact(form){
	if (form.fullname.value=='') return error('Input your Full name', form.fullname);
	if (form.phonenumber.value=='') return error('Input your phone number', form.phonenumber);
	if(notNumber(form.phonenumber)) return error('Your phone number invalid', form.phonenumber);
	if (form.email.value=='') return error('Input your Email', form.email);
	if(notEmail(form.email)) return error('Your Email invalid', form.email);
	if (form.code.value=='') return error('Input verify code', form.code);
}