function CompteurString(fn,wn,rn,mc) 
{   
	var len = fn.value.length;
	if (len > mc) 
	{
		fn.value = fn.value.substring(0,mc);     len = mc;  
	}   
	document.getElementById(wn).innerHTML = len;
	document.getElementById(rn).innerHTML = mc - len; 
}