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This is a litle manual to setup and enable JQuery javascript libraries against default scriptaculous ones. 

DSpace JSPUI interface bundles scriptaculous javascript libraries in every page head section. We can check that looking at source code of DSpace home page, we'll see this few lines: 

<script type="text/javascript" src="/jspui/static/js/scriptaculous/prototype.js"> </script>
<script type="text/javascript" src="/jspui/static/js/scriptaculous/effects.js"> </script>
<script type="text/javascript" src="/jspui/static/js/scriptaculous/builder.js"> </script>
<script type="text/javascript" src="/jspui/static/js/scriptaculous/controls.js"> </script>

...

Doing a litle browsing we can check that this libraries are used on this other libraries:

\[dspace-source\]/dspace-jspui/dspace-jspui-webapp/src/main/webapp/static/js/choice-support.js \\

// Create popup window with authority choices for value of an input field.
// This is intended to be called by onClick of a "Lookup" or "Add" button.
function DSpaceChoiceLookup(url, field, formID, valueInput, authInput,
confIndicatorID, collectionID, isName, isRepeating)
{
...
cOffset = $(inputField).cumulativeOffset();
...
}