Mpg opens in quicktime

Hi There

Hope somebody can help me! I made a marketing html website which will be distributed on CD… It contains mpg files… On some pc’s the mpg’s open up in WMP, and on other pc in a browser, an embedded Quicktime… My client has got a HUGE problem with this, because you can’t resize the quicktime movie, and they need to show it on projectors, etc…

PLEASE can somebody help me, and tell me what to do! This is very urgent… if you don’t mind!

Thanks in advance!