msg while generate large pdf file

[eluser]kmil0[/eluser]
hi guys.

thanks for the replays.
I have try with ajax. but with not success, in jQuery I try this

Code:

$("#link").click(function(e) {
   op = {
        url:'url_to_pdf',
        dataType: // what could be the data type to recieve from the server??
        success: function(d)
        {
           // what to do when I have the RAW PDF data in d ???  
        }
     }
     $.ajax(op);
});

I try with something like this. but with not success
This is making me sick :S

thanks!