function ccounter_func()
{
 	var $max = 200;
 
	var $msginput = document.getElementById("msginput");
	var $ccounter_input = document.getElementById("ccounter");
	var $msglen = $msginput.value.length;
 
	if($msglen > 0) {
		var $ccounter = $max - $msglen;
		$ccounter_input.value = $ccounter;
	} else {
		$ccounter_input.value = $max;
	}
 
	if($msglen > $max) {
		alert("Üzenet max hossza: "+$max);
		$msginput.value = $msginput.value.substring(0,$max);
		$ccounter_input.value=0;
	}
}

ccounter_func();
$msginput = document.getElementById("msginput");
$msginput.onkeyup = ccounter_func;