Client Side Object Model SharePoint 2010 - Assigning a variable to a list item

The Item ID is coming through if I output it as

<div id="content16"></div>

in the HTML Webpart.

but I want it to be assigned to the variable called rssSiteList

are you suggesting I do this

_spBodyOnLoadFunctionNames.push("retrieveListItems");

does this in anyway conflict with ?

ExecuteOrDelayUntilScriptLoaded(retrieveListItems, "sp.js");