Internet Explorer
Open your Internet Explorer browser and from the menu go to Tools > Internet Options. On the General tab, click the Delete Files button. Next, click the OK button then and close your browser.

Netscape
Open your Netscape browser and from the menu go to your Edit > Preferences. Under the Advanced category, select the Cache subcategory. Click the "Clear Cache" button on the Cache panel. Next click the OK button, then quit and restart your browser.

Safari
Go to your Safari browser and from the menu select "Reset Safari" to clear your browser history, cache, and cookies all at once. Click "Reset" on the confirmation dialog to complete this process. If you don't want to clear your browser's history, you can go to "Preferences" under the Safari menu and clear cache under "Advanced"