function checkLen(formname, limitfield, limitCount)
{
maxLen=limitCount;
var txt=document.formname.limitfield.value;

if(txt.length>maxLen)
    {
      alert("Bitte maximal "+maxLen+" Zeichen eingeben!");
      document.formname.limitfield.value=txt.substring(0,maxLen);
      document.formname.zaehler.value=0;
    }
else
    {
    document.formname.zaehler.value=maxLen-txt.length;
    }
}

function limitText(limitField, limitCount, limitNum) {
	if (limitField.value.length > limitNum) {
		limitField.value = limitField.value.substring(0, limitNum);
	} else {
		limitCount.value = limitNum - limitField.value.length;
	}
}