$(window).(function(){
var maxHeight = 330;
if  (maxHeight < 331)
$('.ui-lightbox-mid').addClass('addScroll');
else
$('.ui-lightbox-mid').removeClass('addScroll');
});

$(document).ready(function() {
    var maxHeight = 330,
        lightbox = $('.ui-lightbox-mid'), // caching reference
        lightboxHeight = lightbox.height(); // get the current height
                                            // of lightbox, to compare
                                            // with maxHeight

    if ( maxHeight < lightboxHeight )
       lightbox.addClass('addScroll');
    else
       lightbox.removeClass('addScroll');
});

$(window).(function(){

$(window).load(function(){