How to grab parts of URL and paste it somewhere on the page

I need a javascript (preferably) for my mediawiki website that will grab the end of the url, for example from http://ift.tt/1DQkxgy I would like it to grab the ID 125004192 and then add it somewhere on the same page like this

<a id="various3" href="http://ift.tt/1DQlBB3">

the begging would be static and the ID would be added after '?item=', which would result in:

<a id="various3" href="http://ift.tt/1Hsn91Q">

Is this even possible?