I don't know how it is with arabis, but: make sure you've got arabic fonts installed. They will be useful :-). If the web page is properly written (encoding set at the beggining) it should look good the first time.
It will be good also to configure your browser. In Netscape it's Edit -> Preferences -> Navigator -> Languages -> Default Character Coding. There are four arabic codings available, but I think ISO-8859-6 will be the best choice.