There are no specific issues with Arabic texts. All parts of the Web support Unicode, and this script is supported on nearly all modern systems by default, without a need to install or configure anything culture-specific. But you need to indicate what encoding you are using.
One possible missing piece could be the "charset" of the content type of your HTML page, which can be fixed in the
attribute of the
element, a child if the
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
I could be something else, so checkup everything to make sure that you don't use any other encodings anywhere in between.