[jQuery] Need help learning

[jQuery] Need help learning

I have been reading and playing around with jQuery and can do
somethings, but making a plugin is hurting my brain. Here is what I
have.
function
$
{
    $.fn.myPlugin = function
{
        this.each
function
{
            alert
this.id
            $.get
"return.php",function
data
{
                alert
this.id
;
                //do something with "this" & the "data"
            }
;
        }
;
        return this;
    };
}
jQuery
;
$
document
.ready
function
{
$
"div"
.myPlugin
;
}
;
<div id="myID"></div>
Here is what I don't understand. The first alert shows the id, but the
second one does not, It alerts "undefined". I want to be able to
modify the object
"this
after receiving the data from the ajax.