Why some browsers append an attachauth parameter into each URL?
<p>I have a problem with Chrome and Firefox for Mac. I'm trying to make an image switch each time the user clicks on it but every time I change the scr attribute of the image, the browser sends a request in which URL an "attachauth" parameter containing a random hash number was appended.</p>

<p>The thing is that because of this undesired parameter, the browser never takes the image from cache, making an awful and slow user experience.</p>

<p>Please, some one knows how to turn this "feature" off?</p>
