window.addEvent('domready', function() {
	//alert("DOM!!");
	$('frm_submit').addEvent('click', function(e){
		ev = new Event(e);
		var error = 0;
		['firstname', 'lastname', 'email', 'message'].each(function(item, index){
			f = 'frm_' + item;
			if ($(f).getValue() == '') {
				$('warn_' + item).setStyle('display', 'inline');
				error++;
			} else {
				$('warn_' + item).setStyle('display', 'none');
			}
		});
		
		if (error > 0) { ev.stop(); }
	});
	
	$('frm_howhear').addEvent('change', function(e){
		c = $('frm_howhear').getValue();
		if (["2", "5", "6", "9"].contains(c)) {
			$('specific').setStyle('display', 'block');
		} else {
			$('specific').setStyle('display', 'none');
		}
	});
});