// Check if browser if W3C DOM compliant
var W3CDOM = (document.getElementsByTagName && document.createElement);
firstError = true;

// Validate PayPal Booking Form
function validate()
{
	formValid = true;	
	
	if(document.booking_form.mailformFromName.value == ""){
		
		writeError(document.booking_form.mailformFromName,"Please enter your name");
		formValid = false;
	}
	
	if(document.booking_form.mailformFromEmail.value == ""){
	
		writeError(document.booking_form.mailformFromEmail,"Please enter your email address");
		formValid = false;
	}


	return formValid;

}//validate()

// Writes an error message into the form
function writeError(obj,message) {
	errorstring = '';
	
	if (obj.hasError) return;
	if (W3CDOM) {
		obj.className += ' error';
		obj.onchange = removeError;
		var sp = document.createElement('span');
		sp.className = 'error';	
		sp.appendChild(document.createTextNode(message));
		obj.parentNode.appendChild(sp);
		obj.hasError = sp;
	}
	else {
		errorstring += obj.name + ': ' + message + '\n';
		obj.hasError = true;
		alert(errorstring);
	}
	if (firstError){
		firstError = obj;
		firstError.focus();
		firstError = false;}
}

// Removes an error message from the form
function removeError()
{
	this.className = this.className.substring(0,this.className.lastIndexOf(' '));
	this.parentNode.removeChild(this.hasError);
	this.hasError = null;
	this.onchange = null;
}

// Clears all error messages on form reset
function clearErrors()
{
	var x = document.forms[0].elements;
	for (var i=0;i<x.length;i++) {
		if (x[i].hasError)
		{
			x[i].className = x[i].className.substring(0,x[i].className.lastIndexOf(' '));
			x[i].parentNode.removeChild(x[i].hasError);
			x[i].hasError = null;
			x[i].onchange = null;
		}
	}
	
}