// pop up window function
function openWin(sam, bob, tam) {
	sam = "screens/" + sam + ".html";
	window.open(sam, "Properties", "width=" + bob + ",height=" + tam + ",resizable=no,scrollbars=no,toolbar=no,location=no,status=no,menubar=no,left=100,top=50");
}

function validateForm() {
	var continueToSubmit = true;
	if( continueToSubmit && document.optin.email.value.length == 0 )
	{
		continueToSubmit = false;
		alert('You must provide an email address.');
		document.optin.email.focus();
	}
	if( continueToSubmit && document.optin.email.value.length != 0 )
	{
		var emailValue = document.optin.email.value;
		if( ( emailValue.indexOf( '@' ) <= 0 ) || ( emailValue.indexOf( '.', emailValue.indexOf( '@' ) ) <= 0 ) )
	{
			continueToSubmit = false;
			alert('You must provide a valid email address.');
			document.optin.email.focus();
		}
	}
	if( continueToSubmit )
	{
		document.optin.submit();
	} else {
		alert('no show');
	}
}