Java script no executing in Rails app - ruby-on-rails

Question

I am trying to add a javascript image slider on a basic rails app. I added the JS file to assets/javascripts folder but my javascript is not executing.
I added my html file below. Can anyone one please tell me what am I missing?
<div class="slider">
<!-- Slideshow 3 -->
<script>
// You can also use "$(window).load(function() {"
$(function () {
// Slideshow 3
$("#slider3").responsiveSlides({
manualControls: '#slider3-pager',
});
});
</script>
<ul class="rslides" id="slider3">
<li>
<div class="banner">
<h1>What a beautiful bike</h1>
<h2>timeless, atmospheric<br>& uncredible bikes!</h2>
</div>
</li>
<li>
<div class="banner banner2">
<h1>What a beautiful bike</h1>
<h2>timeless, atmospheric<br>& uncredible bikes!</h2>
</div>
</li>
<li>
<div class="banner banner1">
<h1>What a beautiful bike</h1>
<h2>timeless, atmospheric<br>& uncredible bikes!</h2>
</div>
</li>
</ul>
<ul id="slider3-pager">
<li><img src="assets/device3.jpg" alt=""></li>
<li><img src="assets/device2.jpg" alt=""></li>
<li><img src="assets/device1.jpg" alt=""></li>
</ul>
<div class="clearfix"> </div>
</div>