Problem with Internet Download Manager

[idonthaveusername9]

I have implemented this PDFViewer exactly as it was shown in the examples, but when i try to open my web page IDM immediately tries to download it and because of it (i think) pdf is not displayed on the page. How can i fix that? I dont know why but when i open your demo website, there is no any problem with IDM.

p.s if i just turn off IDM everything works fine, but i need to get it work even on devices IDM is installed.