Q1.
1.1me = $('#win_content_copy').find('#categoryname');
alert(me.value).text();

[ans:]its worng. text() alert-method response undefined.

1.2alert(me.text());
[ans:]its working

1.3alert(me.val());
[ans:]when we use input marksigned ,have to

Q2.time control

//sleep(4000);
//setInterval("categoryname_keydown();", 3000);
//event.timeStamp;
//setTimeout("alert ('called from setTimeout()');",4000);
Q3.when you clone a DOM element

window_content_copy = $('#window_content').clone();
window_content_copy.attr('id','win_content_copy');
window_content_copy.appendTo('#body');

is html inside script syntax
onclick='function(this)'  (<---wrong)
onclick='function($(this))'   (<---right)