how to use substr function in this script I need substr(0,25);
<a class="dep_buttons" href="#"> something text something text something text something text something text something text </a>
$('.dep_buttons').mouseover(function(){
    if($(this).text().length > 30) {
        $(this).stop().animate({height:"150px"},150);
    }
    $(".dep_buttons").mouseout(function(){
        $(this).stop().animate({height:"40px"},150);
    });
});