In your theme's layout.xml file add a section like this
<default>
<reference name="head">
<action method="addItem">
<type>skin_js</type>
<name>js/lib/jquery-1.10.2.min.js</name>
</action>
<block type="core/text" name="google.cdn.jquery">
<action method="setText">
<text>
<![CDATA[<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<script>
window.jQuery||document.write('<script src="/skin/frontend/rwd/default/js/lib/jquery-1.10.2.min.js">
\x3c/script>
');</script>
<script>
jQuery.noConflict();</script>
]]>
</text>
</action>
</block>
</reference>
</default>
Now, instead of $() use jQuery() to use jQuery functions / features wherever needed
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