[Rails] javascript tabs not working in rails app

This is in application.html.erb:
<script type="text/javascript"
src="../javascripts/application.js"></script>
<script type="text/javascript"
src="../javascripts/jquery-1.4.2.js"></script>

<div id="content">

<%= yield :tabContent %>

</div>

This is in index.html.erb in views/products:
<% content_for :tabContent do %>
<div class="tabContent" id="a">
<p>
Content
</p>

</div>

<div class="tabContent" id="b">

<p>
Content
</p>

</div>

<div class="tabContent" id="c">
<p>
Content
</p>
</div>
<% end %>

This is in application.js:

$(document).ready(function() {
var linksToInt = {
"#i": 0,
"#j": 1,
"#k": 2,
"#a": 3,
"#b": 4,
"#c": 5,
"#d": 6,
"#e": 7,
"#f": 8,
"#g": 9,
"#h": 10}

$("a").click(function(){displayDiv($(this).attr("href"));});

function displayDiv(id){
var linkInt = linksToInt[id];
on_btn_click(linkInt);
}

function on_btn_click(displayDiv){
displayDiv != null ? null : this;

switch(displayDiv){
case 0:
$("#content > div").hide();
$("#a").show();
break;
case 1:
$("#content > div").hide();
$("#b").show();
break;
case 2:
$("#content > div").hide();
$("#c").show();
break;
case 3:
$("#content > div").hide();
$("#d").show();
break;
case 4:
$("#content > div").hide();
$("#e").show();
break;
case 5:
$("#content > div").hide();
$("#f").show();
break;
case 6:
$("#content > div").hide();
$("#g").show();
break;
case 7:
$("#content > div").hide();
$("#h").show();
break;
case 8:
$("#content > div").hide();
$("#i").show();
break;
case 9:
$("#content > div").hide();
$("#j").show();
break;
case 10:
$("#content > div").hide();
$("#k").show();
break;
}
}});

It just doesn't hide the divs and show the one specified. I tried it out
in a regular html and javascript file to test it and it worked, but in
rails app, it isn't working.

Thanks for any response.
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