// correct format for email address
function IsEmailAddress (string)
{
	var addressPattern = 
		/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
	return addressPattern.test(string);
}

// radio button selection
function IsRadioSelected(theForm, name)
{
	var i;
	for(i = 0; i < theForm.elements.length; i++)
	{
		if(theForm.elements[i].type == "radio" && theForm.elements[i].name == name &&
			theForm.elements[i].checked == true)
		{
			return true;
		}
	}
	return false;
}

// setMaxLength function from QuirksMode - www.quirksmode.org
function setMaxLength() {
	var x = document.getElementsByTagName('textarea');
	var counter = document.createElement('div');
	counter.className = 'counter';
	for (var i=0;i<x.length;i++) {
		if (x[i].getAttribute('maxlength')) {
			var counterClone = counter.cloneNode(true);
			counterClone.relatedElement = x[i];
			counterClone.innerHTML = 'Characters typed: <span>0<\/span>/'+x[i].getAttribute('maxlength');
			x[i].parentNode.insertBefore(counterClone,x[i].nextSibling);
			x[i].relatedElement = counterClone.getElementsByTagName('span')[0];

			x[i].onkeyup = x[i].onchange = checkMaxLength;
			x[i].onkeyup();
		}
	}
}

function checkMaxLength() {
	var maxLength = this.getAttribute('maxlength');
	var currentLength = this.value.length;
	if (currentLength > maxLength)
		this.relatedElement.className = 'toomuch';
	else
		this.relatedElement.className = '';
	this.relatedElement.firstChild.nodeValue = currentLength;
	// not innerHTML
}

addEvent(window,'load',setMaxLength);