Planet CakePHP

I have a link and on clicking it, a function is called. In that function, I set the href attribute to pass an id variable. If I alert the href value, I see the correct url along with the Id. But in the corresponding function in the controller, If I do an $_GET of that variable Id, I do not get the value. What is the error?

This is my link:

Export

And the corresponding on click function:

$("#export_entries").click(function() {
	$(this).attr("href",$(this).attr("href")+"&id="+formid);
	alert($(this).attr("href"));
});

In this alert box,If I click the second link, I get the value as

 http://localhost/FormBuilder/reports/export?height=220&width=350&id=2

But In my export function in the controller I do not get the value. The variable formid is empty.

function export()
   {

        $formid=$_GET['id'];
        echo " formid: ".$formid;
        $this->set('formid',$formid);
   }