/* Checks whether fields have been filled or not */
function check_fields(first_name, domain) {
	if ( (first_name.value!='your-first-name') 
		&& (first_name.value!='')
		&& (domain.value!='your-last-name')
		&& (domain.value!='') )  {
		return true;
	}else{
		alert('Both fields should be filled !');
		return false;
	}
}

/* Checks if passwords are similar and if their size is minimum 4 */
function check_passwords() {
	var frm = document.forms[0];
	if (frm.password.value != frm.password2.value) {
		alert('Password and its confirmation do not match !');
		return false;
	}else if (frm.password.value.length < 4) {
		alert('Password must be at least 4 characters long ');
		return false;
	}else {
		return true;
	}
}

/* Checks whether the checkbox is ticked or not */
function check_check_box(box) {
	if (! box.checked) {
		alert('You must agree the terms of service to go on');
		return false;
	}else {
		return true;
	}
}


/* check email if checkbox is checked */
function check_email_if_necessary(box, email) {
	box = getRefToDiv(box);
	email = getRefToDiv(email);
	if (box.checked) {
		if (! validateEmailv2(email.value) || email.value.length == 0) {
			alert('Please enter a valid email address to forward to\n(e.g. peter@smith.com)');
			return false;
		}
	}
	return true;
}


/* reload the price field when nbYears is modified */
function reloadPrice() {
	price = getRefToDiv('years').nbYears.value*20;
	getRefToDiv('years').price.value = price + " €";
}

/* Hide elements functions */
function getRefToDiv(divID) {
	if( document.getElementById ) { return document.getElementById(divID); }
	if( document.all ) { return document.all[divID]; }
	window.alert('Nothing works in this browser');
	return false;
}
function showDiv(divID_as_a_string) {
	var myReference = getRefToDiv(divID_as_a_string);
	if( !myReference ) { window.alert('Nothing works in this browser'); return; }
	if( myReference.style ) { myReference.style.visibility = 'visible'; } else {
		if( myReference.visibility ) { myReference.visibility = 'show'; } else {
			window.alert('Nothing works in this browser'); return; } }
}
function hideDiv(divID_as_a_string) {
	var myReference = getRefToDiv(divID_as_a_string);
	if( !myReference ) { window.alert('Nothing works in this browser'); return; }
	if( myReference.style ) { myReference.style.visibility = 'hidden'; } else {
		if( myReference.visibility ) { myReference.visibility = 'hide'; } else {
			window.alert('Nothing works in this browser'); return; } }
}

/* switch input element disabled state and show/hide id div */
function switch_input_element_access(element, id) {
	if (getRefToDiv(element).disabled) {
		showDiv(id);
		getRefToDiv(element).disabled = false;
	}else {
		hideDiv(id);
		getRefToDiv(element).disabled = true;
	}
	return true;
}

/* echo 0->@ 1->. */
function echo(id) {
	if (id == 0)
		document.write("@");
	if (id == 1)
		document.write(".");
}