$(document).ready(function() {
    var click = 0;
    var img_width = $('.slider img:first-child').width();
    var img_container = $('img').length;

    $('.slide_container').css('width', img_width * img_container + 'px');

    $('.slide_next').click(function(){
        if(click < img_container -1 ) {
            click++;
            var left = img_width * click;
            $('.slide_container').animate({
            'left':-left + 'px'
            }, 500);
        }

});
    $('.slide_prev').click(function(){
        if(click != 0) {
            click--;
            var left = img_width * click;
            $('.slide_container').animate({
            'left':-left + 'px'
            }, 500);
        }
    });
});