Problem with progress bar

I have a frameset,leftframe and rightframe. Leftframe displays links and clicking on these links the appropriate page is shown in the rightframe.The rightframe accepts some inputs and submits to another page (.asp page).This page creates a .PDF report.
When i click on a link for the first time and try to generate a report , the report is displayed, also the progress bar is shown. But when i reload the page and try to generate the report again , though the report is generated in PDF format, the progress bar is not shown. This happens when the PDF is integrated within the browser. This does not happen when the PDF is shown outside the browser. Can anyone tell me how do i resolve this issue? Thanx in advance.