// add an event listener in a cross-browser-style way
function addEvent(obj, evType, fn)
{
	if (obj.addEventListener)
	{
	obj.addEventListener(evType, fn, false);
		return true;
	}
	else if (obj.attachEvent)
	{
		var r = obj.attachEvent("on"+evType, fn);
		return r;
	}
	else
	{
		return false;
	}
}

// swap an image
function imgSwap(oRef, sFileName) {
	oRef.src = sFileName;
}

// check mailing list form for an email address
function checkForm()
{
	if (document.getElementById('txtEmail').value.indexOf('@') == -1)
	{
		alert('Please enter a valid email address');
		return false;
	}
}