Código Javascript
:
Ver original<script type="text/javascript">
function fnc(n){
document.getElementById('boton').disabled = (n <=9) ? true : false;
}
//-->
</script>
<form name="from1" method="post" id="form1" action="">
<textarea name="area1" cols="50" id="area1" style="text-align:left;" type="text" onkeyup="fnc(this.value.length);"></textarea>
<input class="searchSubmit" type="submit" name="boton" value="submit" />
</form>