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Faça assim amigo.

<script language="javascript">
function tamanhoCampo(sCampo,sDiv){

   if(sCampo.value.length > 158){

      //Se você quiser bloquear para deixar o usuario digitar somente N caracteres desomente a linha abaixo
      //Tirando as "//" da linha
      //sCampo.value = sCampo.value.substring(0,158)

      document.getElementById(sDiv).innerHTML = "Você já utrapassou 158 carateres!<br>Já digitou: "+ sCampo.value.length;

      document.getElementById(sDiv).innerHTML = "Você já digitou: "+ sCampo.value.length;
E dentro do corpo você pode chamar a função assim
<textarea name="text" onkeypress"tamanhoCampo(this,'mostrarOValorDentroDoMeuDiv');"></textarea>
<div id="mostrarOValorDentroDoMeuDiv"></div>

Espero ter ajudado...

Marcos Oliveira

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