<table "400" border="0" cellspacing="0" cellpadding="0">
<tr valign="middle" bgcolor="#F3F3F3">
<td height="26" valign="top" align="left">
<textarea name="个人介绍" cols="50" rows="6" class="bot" id="youbian" onkeyup="checkLength(this);">zzz</textarea>
<br>
限制字数显示剩余字数，最大长度: 500
还剩: <span id="chLeft">500</span><br>
</td>
</tr>
<script type="text/javascript">
function checkLength(which) {
var maxChars = 500;
if (which.value.length > maxChars)
which.value = which.value.substring(0,maxChars);
var curr = maxChars - which.value.length;
document.getElementById("chLeft").innerHTML = curr.toString();
}
</script>
</table>