function showlimit(id,limit) {

	checklimit(id,limit);

	id = id + "_limit";
	document.getElementById(id).style.display = "block";
	
}

function hidelimit(id,limit) {
	
	checklimit(id,limit);
	
	id = id + "_limit";
	document.getElementById(id).style.display = "none";
	
}

function checklimit (id,limit) {
	
	var anzch = document.getElementById(id).value.length;
	var rest = limit - anzch;
	
	if (rest <= 0) {
		
		document.getElementById(id).value = document.getElementById(id).value.substr(0,limit);
		rest = 0;
		document.getElementById(id + "_limit_ch").style.color = "red";
		
	} else {
		document.getElementById(id + "_limit_ch").style.color = "";
	}
	
	document.getElementById(id + "_limit_ch").innerHTML = rest;
	
}