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In Opera click on the 'Tools' menu (step 1) and select 'Preferences' (step 2) as shown on the picture.

Click on the 'Advanced' tab (step 3), then click on the 'Content' option (step 4) and check the 'Enable JavaScript' checkbox (step 5). Finally click on the 'OK' button (step 6). This concludes enabling JavaScript for Opera 8 or 9.

If the problematic Web page (which did not work without JavaScript) is still opened inside Opera, simply press the 'F5' key on your keyboard to reload it. Now it should work correctly.

Note: This procedure applies to older and/or future versions of Opera as well, with minor differences. The most important step is to find the 'Enable JavaScript' option and check it.