Installation is as trivial as following the 3 steps given below...

Step 1:

Include a reference to the jQuery library and the jCarouselLite plugin. You can download jQuery here and jCarouselLite here. If you like interesting effects, include the Easing plugin as well (Optional). You may also want to use a compatibility easing plugin if you want to use old easing names (Optional). If you would like to navigate the carousel using mouse wheel, then include the mouse-wheel plugin as well (Optional).

<script type="text/javascript" src="path/to/jquery.js"></script>
<script type="text/javascript" src="path/to/jquery.jcarousellite.js"></script>

<!-- Optional -->
<script type="text/javascript" src="path/to/easing.js"></script>
<script type="text/javascript" src="path/to/mousewheel.js"></script>

Step 2:

In your HTML file, provide the markup required by the carousel (a div enclosing an ul). You also need the navigation buttons, but these buttons need not be part of the carousel markup itself. An example follows...

<button class="prev">&laquo;</button>
<button class="next">&raquo;</button>

<div class="any-class">
    <ul>
        <li><img src="image/1.jpg" style="width:150px; height:118px;"></li>
        <li><img src="image/2.jpg" style="width:150px; height:118px;"></li>
        <li><img src="image/3.jpg" style="width:150px; height:118px;"></li>
        <li><img src="image/4.jpg" style="width:150px; height:118px;"></li>
        <li><img src="image/5.jpg" style="width:150px; height:118px;"></li>
    </ul>
</div>

Step 3:

Fire a call to the plugin and supply your navigation buttons. You just managed to architect your own carousel.

$(function() {
    $(".any-class").jCarouselLite({
        btnNext: ".next",
        btnPrev: ".prev"
    });
});

Your next stop should be to learn how to style your carousel. After that you can visit the various Demos or the documentation.