Do I understand that if you add an element (e.g. div of id="test") in the script section of the page, and then the page is sent back from the server (posted back) this element no longer exists? That is, I cannot use this element in the IF statement of the javascript?

For example, I want to call a certain method of the page but only One Time. And I was doing the following (which does not seem to work):

        if ($('#Test').length==0) {
               // div of ID Test does not exist.
               // create this div
               var $div = $('<div />').appendTo('body');
               $div.attr('id', 'Test');
               // Call button click method.
               document.getElementById("btnTest").click();
           }

The above seem to go into an endless loop.

Any suggestions? TIA