function ValidateEmail(emailItem, itemLabel)
{
	if(emailItem.value.length > 0)
	{
		//var email = document.getElementById(’emailaddress’);
		var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (!filter.test(emailItem.value)) 
		{
			alert('Please provide a valid ' + itemLabel + ' address');
			emailItem.focus();
			emailItem.select();
			return false;
		}
	}
}