Many Anti virus disable javascript in browsers because JavaScript code can run locally in a user’s browser (rather than on a remote server), the browser can respond to user actions quickly, making an application more responsive. Furthermore, JavaScript code can detect user actions which HTML alone cannot, such as individual keystrokes. Applications such as Gmail take advantage of this: much of the user-interface logic is written in JavaScript, and JavaScript dispatches requests for information (such as the content of an e-mail message) to the server. The wider trend of Ajax programming similarly exploits this strength.

Sometimes we need to enable javascript to make full use of web pages.

Here is tutorial to enable javascripts in different browsers

How to enable JavaScript in Internet Explorer 5.x or 6.x?

 

1.From the Tools menu, click Internet Options.

2.From the Security tab, click Custom Level. ( The Internet icon is highlighted by default. )

3.Scroll to Java permissions, click to select High safety.

4.Click OK twice

From the File menu, click Close.

Relaunch your browser.

Internet Explorer (9.0)

1. Select Tools from the top menu.
2. Choose Internet Options.
3. Click on the Security tab.
4. Click on Custom Level.
5. Scroll down until you see the section labeled ‘Scripting.’
6. Under ‘Active Scripting,’ select Enable and click OK.

 

Mozilla Firefox

At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click Options

In the Options window, select the Content panel.
Enable JavaScript: Select this option to permit JavaScripts to execute on your computer.
Click OK to close the Options window

To change advanced settings, click Advanced….
Advanced JavaScript settings
Through the Advanced JavaScript Settings window, you can configure the permissions for JavaScripts.

Move or resize existing windows: To prevent JavaScripts from changing the position or size of existing windows, deselect this option.
Raise or lower windows: This option allows sites to place windows below or above existing windows.
Disable or replace context menus: When you right-click an item, a sub-menu may appear. This menu, called a “context menu,” can be disabled through JavaScripts. To prevent them from disabling context menus, deselect this option.

Google Chrome (15.0)

1. Click the spanner icon on the browser toolbar.
2. Select Options.
3. Click the Under the Hood tab.
4. Click Content Settings in the ‘Privacy section.’
5. Select Allow all sites to run JavaScript in the ‘JavaScript’ section.

Apple Safari (5.0)

1. Open the Safari menu on your browser’s toolbar.
2. Choose Preferences.
3. Choose Security.
4. Select the checkbox next to Enable JavaScript.

Even after doing above steps you are facing problem related to javascript then you should check setting in your firewall or antivirus.

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