How to clear your cache on Firefox, Netscape, or Explorer:
Web browsers store data (like images, etc.) from websites that you visit so that when you revisit, you do not need to download all of the images again, thus making it a quicker visit. Sometimes, though, this makes it hard for you to see changes that have been made to the website, because your browser wants to keep showing you the old stuff that it has memorized for you. You need to clear your cache when you can't see changes in a website.
Mozilla Firefox Instructions:
Go to Tools > Options, select Privacy and click the Clear button next to the Cache item in the list.
You can also clear the stored data from your history, saved form information, saved passwords, recently downloaded files, and cookies, each individually so that you do not delete the content that you do want to keep.
Microsoft Internet Explorer Instructions:
Click Tools from the menu bar. Select Internet Options. On the General Tab, usually the default tab, you will see an area labeled Temporary Internet Files. In that section is a button that says Delete Files. Press this button. Press OK on the dialogue window that opens up.