function submitForm() {
	if (($('newsletter').checked) && ($('email').value.empty())) {
		$('emailWarning').show();
		new Effect.Highlight('emailWarning');
		return false;
	} 
	if ($('signature').value.empty()) {
		$('signatureWarning').show();
		new Effect.Highlight('signatureWarning');
		return false;
	} else {
		$('signform').submit();
		return true;
	}
}

function changeTab(newTab) {
	$$('tabs > .li').each(function(item){
		item.removeClass('active');
		if (item.id == newTab + 'Link') {
			item.addClass('active');
		}
		}
	);
}