yup, totally, that is why they invented a textarea 
How about applying this little snip of javascript to your text area 
HTML Code:
<script>
//Text field counter
function textCounter(field, countfield, maxlimit)
{
if (field.value.length > maxlimit) // if too long...trim it!
field.value = field.value.substring(0, maxlimit);
else
countfield.value = maxlimit - field.value.length;
}
</script>
<form>
Characters left:<input readonly="readonly" type="text" name="remLen" size="3" maxlength="3" value="250" style="width:30px" />
<textarea id="sfD" class="frm" name="desc" cols="50" rows="5" onkeydown="textCounter(this.form.desc,this.form.remLen,250);" onkeyup="textCounter(this.form.desc,this.form.remLen,250);">
</form>
obviously that is a pretty basic and you will need to style it etc but that is how you can limit a textarea 
please excuse my code its old but the concept's there 
hope that helps
/Ox
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