If you have a Windows Mobile phone, download a version of the Opera browser. According to Microsoft, since the default browser for Windows Mobile phones, Internet Explorer, can run only a small subset of Javascript functions, you will need a new browser to run most Javascript applications. A writer at Boutell.com suggests that you download Opera's free browser, use it to open up a new Web page and then click on the "Tools" tab. Open the "Quick Preferences" menu and check the "Enable Javascript" box.
Read more :
How Do You Enable Javascript on a Phone? | eHow