You have to enable JavaScript in your Blackberry browser.
1. In the browser, press the Menu key.
2. Click Options.
3. Click Browser Configuration.
4. Select the following check boxes:
        Support JavaScript
5. Press the Menu key.
6. Click Save Options.

Or please manually select one of the following links:
mCall Manager for OS 4.2.1 - 4.3
mCall Manager for OS 4.5 - 4.6
mCall Manager for OS 4.7
mCall Manager for OS 4.7 Touch screen
mCall Manager for OS 5.0
mCall Manager for OS 5.0 Touch screen