function validate_contact(f) {
	var msg = ''
	var objRegExp  = /(^([a-z0-9_\.\-]*)@([a-z0-9_\.\-]*)([.][a-z]{2,4})$)|(^([a-z0-9_\.\-]*)@([a-z0-9_\.\-]*)(\.[a-z]{2,3})(\.[a-z]{2})+$|(^[a-z0-9_\.\-]*)@([0-9]+)(\.[0-9]+)(\.[0-9]+)(\.[0-9]+)+$)/i;
	if (!f.fullname.value.length) msg += 'Please provide your full name\n'
	if (!f.email.value.length) msg += 'Please provide your email address\n'
	else if (!objRegExp.test(f.email.value)) msg += 'Please provide a valid email address\n'
	if (!f.phone.value.length) msg += 'Please provide your phone number\n'
	if (msg) alert(msg)
	return (msg=='')
}