linux server hosting

If I change from windows to linux hosting, will my site still work?
I use linux on my laptop and desktop. I am a webmaster for a local business, but their site was on a windows hosting account before I was the webmaster. I would like to use .php and mysql on the site which would give me the ability to do all kinds of cool things with it. The site currently is only html and flash, so asp databases or anything. If I have my host switch the site to linux servers, will the site go unchanged or will it get all messed up?
If all you are using is HTML, you should not experience any differences. In fact, php should work better on Linux as that is its native environment.
Running php on Linux gives you more options not directly available on IIS, (e.g., use of the .htaccess file)
Whatever the case, I would do my own backup of the site prior to switch over because you can never predict what will happen. Having your own backup will allow you to upload your site to the new location if the switchover doesn't work out well
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