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Code:

<script language="javascript" type="text/javascript">

function verifyLength(str, num, checkID){

  var str = document.getElementById(str).value;

  var good = "Your input is long enough";

  var bad = "Your input is too short";



  if(str.length >= num){

    document.getElementById(checkID).innerHTML = good;

    document.getElementById(checkID).className = "verify"

  }

  else{

    document.getElementById(checkID).innerHTML = bad;

    document.getElementById(checkID).className = "verify red"

  }

}

</script>

Usage:

Code:

    <div>

      <label>Password. Minimum 6 characters.<br />

        <input type="password" name="registerFormPassword" id="registerFormPassword" class="field" value="" tabindex="3"

          onkeyup="javascript:verifyLength('registerFormPassword', '6', 'verifyLengthregisterFormPassword');" />

      </label>

      <br />

      <span id="verifyLengthregisterFormPassword" class="verify">&nbsp;</span>

    </div>

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