Your browser can only display fonts that are installed on the browser's computer. So, if you are specifying a font that isn't present on Macs, no surprise there. But, in your css file, you can specify which font to use if Freestyle Script isn't present.
You would use something like:
< font face="Lucida Calligraphy,Comic Sans MS,Lucida Console,PrawnHandwrite" >
To specify which font to use, and the alternates are tried in order if the first ones aren't present.
There is a list of fonts common to PC and Mac systems here:
http://www.ampsoft.net/webdesign-l/...Fonts.html