pps files are a bit different than pdf to be shown inside html pages, here is the best way to do it:

Google Docs can serve up PowerPoint (and PDF) documents in it's document viewer. You don't have to sign up for Google Docs, just upload it to your website, and call it from your page:

<iframe src="http://docs.google.com/gview?url=http://www.yourwebsite.com/powerpoint.ppt&embedded=true" style="width:600px; height:500px;" frameborder="0"></iframe>

basically upload your pps inside your server, add the code inside a html object, make sure to change the name and path of your file inside the iframe script

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