//use this: <textarea name="address" onkeypress="return imposeMaxLength(event, this, 150);" style="height:120px; width:200px;"><?php if(isset($_POST['address']))print $_POST['address']; ?></textarea>
                 
function imposeMaxLength(Event, Object, MaxLen)
{
	return (Object.value.length <= MaxLen)||(Event.keyCode == 8 ||Event.keyCode==46||(Event.keyCode>=35&&Event.keyCode<=40))
}