Any experience with PDF's?

Hi everybody... Has anyone have successful experience working with PDF's and Smarty before? I'm using FPDF Class to make a pdf file from a formatted output with no-problems. But, when I try to show it at a web page using Smarty-templates and Plugging, the document is corrupted... I mean, the result that is displayed is not a PDF content.. It display random characters and something unreadable. I suppose that because of the handling the Browser do to the output... Referring to a different content-type or something similar. I did not exactly know what's wrong, so I look for help to solve this problem Before finishing, I have to said that the PDF document is being make successfully... So, it not problem of the FPDF class. Thanks in advance. Best Regards. Juan Camilo