/*
  Form field Limiter script- By Dynamic Drive
  For full source code and more DHTML scripts, visit http://www.dynamicdrive.com
  This credit MUST stay intact for use
  */

  var ns6 = document.getElementById && !document.all;

  function restrictinput(maxlength, e, placeholder) {
      if (window.event&&event.srcElement.value.length>=maxlength) {
          return false;
      } else if (e.target && e.target==eval(placeholder) && e.target.value.length>=maxlength) {
          //detect alphanumeric keys
          var pressedkey=/[a-zA-Z0-9\.\,\/]/;

          if (pressedkey.test(String.fromCharCode(e.which))) {
              e.stopPropagation();
          }
      }
  }

  function countlimit(maxlength, e, placeholder) {
      var theform = eval(placeholder);
      var lengthleft = maxlength - theform.value.length;
      var placeholderobj = document.all? document.all[placeholder] : document.getElementById(placeholder);

      if (window.event || e.target && e.target==eval(placeholder)) {
          if (lengthleft < 0) {
              theform.value=theform.value.substring(0,maxlength);
          }
          placeholderobj.innerHTML=lengthleft;
      }
  }


  function displaylimit(theform,thelimit) {
      var limit_text = 'Aśn dispone de <b><span id="'+theform.toString()+'">'+thelimit+'</span></b> caracteres para este mensaje';

      if (document.all || ns6) {
          document.write(limit_text);
      }

      if (document.all) {
          eval(theform).onkeypress = function(){ return restrictinput(thelimit,event,theform)}
          eval(theform).onkeyup = function(){ countlimit(thelimit,event,theform)}
      } else if (ns6) {
          document.body.addEventListener('keypress', function(event) { restrictinput(thelimit,event,theform) }, true);
          document.body.addEventListener('keyup', function(event) { countlimit(thelimit,event,theform) }, true);
      }
  }