function disable_contact_form() {
	contact_form = document.getElementById("enquiry_form");
	contact_form.style.opacity = 0.3;
	disable_field("contact_name");
	disable_field("contact_email");
	disable_field("contact_phone");
	disable_field("contact_subject");
	disable_field("contact_enquiry");
}

function submit_contact_form(response) {
	updateContent(response);
}

function contact_form_response_success() {
	contact_form = document.getElementById("enquiry_form");
	contact_form.innerHTML = '';
	contact_form.innerHTML = 'Your enquiry has already been sent.';
	contact_form.style.opacity = 1;
}

function contact_form_response_fail() {
	contact_form = document.getElementById("enquiry_form");
	contact_form.style.opacity = 1;
	enable_field("contact_name");
	enable_field("contact_email");
	enable_field("contact_phone");
	enable_field("contact_subject");
	enable_field("contact_enquiry");
}

function disable_field(field) {
	document.getElementById(field).readonly = true;
}

function enable_field(field) {
	document.getElementById(field).readonly = false;
}