I want to show .ppt (PowerPoint) files uploaded by my user on my website. I could do this by converting them into Flash files, then showing the Flash files on the web page. But I don't want to use Flash to do this. I want to show it, like google docs shows, without using Flash.
I've already solved the problem for .pdf files by converting them into images using ImageMagick, but now I have trouble with .ppt files.
Now i found a solution to showing .ppt file on my website without using the flash 
the solution is:
just convert the .ppt file to .pdf files using any language or using software(e.g. open office) and then use Imagemagick to convert that .pdf into image and show to your web page 
once again thanks to you all for answering my question.
How google docs shows my .PPT files without using a flash viewer?