You may be aware that most browsers cache certain files such as images, javascript files, style sheets, etc.  They do this in order to increase performance by decreasing load times. Files that already exist in your cache, do not have to be transmitted over the Internet to your browser. 

There are a number of factors that determine whether a cached file is acceptable for use.  These factors include the age if the file in cache, and the size of the cache ( the amount of space you have allocated on your file system for browser caching ). 

Occasionally your browser will use an existing file from cache when a newer version is available on the server.  This is especially irksome when working with a web developer who makes frequent changes on your web site.  I frequently make a change to a site and have the client say something like "nothing changed!"

Fortunately most browsers employ a short-cut to dump cache and force the browser to reload all the files.  For most browsers, Internet Explorer, Firefox, Chrome and Safari, the short cut is <ctrl> + <del> to dump cache followed by <ctrl>+r to reload the page with all new files.

I hope this helps.

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