Align div correctly on viewport when scrolling

I’m doing a parallax website wherein when the user scrolls the sliders will slide from the left and align within the viewport. The issue is that I have scroll the mousewheel many times in order for the slide to align. Is there a way to make the slide align within the viewport with just one scroll.

Here is my work in progress. I’m using skrollr(http://prinzhorn.github.io/skrollr/) for my parallax designs

http://creativekidsstudio.com/ck/

HTML

    <section  class="slide slide_1">
        <div class="slide_content"  >
            <h2>You see a blank canvas,<br/> we see potential</h2>
	        <img src="<?php bloginfo('template_url'); ?>/images/canvas.png" alt="Canvas" />
	    </div>
     </section>

    <section data-0="transform:translateX(100%); " data-1500="transform:translateX(0%) " class="slide slide_2">
        <div class="slide_content"  >
            <h2>You see a brush,<br/> we see a dream</h2>
            <img src="<?php bloginfo('template_url'); ?>/images/brush.png" alt="brush" />
	    </div>
    </section>

    <section data-1500="transform:translateX(100%); " data-2500="transform:translateX(0%)" class="slide slide_3">
        <div class="slide_content"  >
            <h2>You see a ball of clay,<br/> we see a world of creativity</h2>
            <img src="<?php bloginfo('template_url'); ?>/images/clay.png" alt="clay" />
	    </div>
    </section>

    <section data-2500="transform:translateX(100%); " data-3500="transform:translateX(0%)" class="slide slide_4">
        <div class="slide_content">
            <h1>Every child is a creative kid.</h1>
            <img src="<?php bloginfo('template_url'); ?>/images/kid.png" alt="kid" />
	    </div>
    </section>

CSS

    .slide{width:100%; height:100%; position:fixed}


    .slide_1{background-image:url('images/patternfinal1.jpg'); z-index:1}
    .slide_2{background-image:url('images/patternfinal2.jpg');  z-index:2}
    .slide_3{background-image:url('images/patternfinal3.jpg');  z-index:3}
    .slide_4{background-image:url('images/patternfinal4.jpg'); z-index:4}
    .creative_content{ z-index: 10; position: relative; background-color: white; padding:20px 0; top:5%}

    .slide_content{
        text-align:center;
	    height:100%;
	    position:absolute;
	    top:15%;
	    margin:0 auto;
	    left:0;
	    right:0;
	    z-index:1;
	    font-family: 'anarchisticno_leaders..', sans-serif;
	    font-size:70px;
	    color:#333
    }

    .slide_1 img,
    .slide_2 ing,
    .slide_3 img,
    .slide_4 img{display:block; margin:0 auto}

Here is the javascript that i have implemented but the problem is it seems to stop midway when i scroll.

JAVASCRIPT


    <script>
        var tempScrollTop = 0;
        var currentScrollTop = 0;
        var scrollHeight = $(window).height();
        var newHeight = 0;


        function scrollIt() {

        $(window).off('scroll', scrollIt);

        currentScrollTop = $(window).scrollTop();


        if (tempScrollTop < currentScrollTop) {
            newHeight = newHeight + scrollHeight;
            $('html').animate({scrollTop: newHeight}, 500, function(){
                var setScroll = setTimeout(function(){
                console.log('Animation Complete');
                tempScrollTop = $(window).scrollTop();
                $(window).on('scroll', scrollIt);
                }, 10);
            });

        } else if (tempScrollTop > currentScrollTop){
           newHeight = newHeight - scrollHeight;
           $('html').animate({scrollTop: newHeight}, 500, function(){
                var setScroll = setTimeout(function(){
                console.log('Animation Complete');
                tempScrollTop = $(window).scrollTop();
                $(window).on('scroll', scrollIt);
                }, 10);
            });
        }


    }

    $(window).on('scroll', scrollIt);
    </script>