Link for printing image

Actually I need a bit of Java Script, but I am definitely not good at it. So I would really need your help.

My problem is, that I would need a script, which saves me the url from an id to a variable and outputs the variable something like this: <a href="+ variable +">LINK</a>.

Note, that the ID, where I would like to get the link from, is somewhere in the page and the script likely at the bottom.

EXAMPLE OF WHAT I MEAN:

<div id="http://www.example.com" name="url">
  <p>Some content</p>
</div>
.
.
.
.
<a href="+ variable +">LINK</a>
.
.
.
<script>
   variable = getIdWhereNameIsURL;
   ....
</script>

Would really appreciate your help!