how to get the id of an element and compare it with another one?

how to get the id of an element and compare it with another one?

hello.

i have a file called text.txt that contains:
<li id="unic1">some text</li>
<li id="unic2">some text</li>

and a index.html where i try to find the id from the previous file:

<div id="div">alert(unic_id)'<div>

$(".div").load('text.txt');
 var $unic_id = $source.each(function(){
        .find('li')
        .attr('id');
        });

what am i doing wrong?

thanks