enable multiple dummy ethernet interfaces in Linux

To get my dummy interfaces, just do this:

 modprobe dummy numdummies=5

How can I force a reload of an image from the server if the image already exists in the browser's cache?

Q416 How can I force a reload of an image from the server if the image already exists in the browser's cache?

By adding a different search string value after the image href. The following reloads the image from the server every 10 seconds:

<---script language="JavaScript">
function reloadImage() {   
 var now = new Date();   
 if (document.images) {       
   document.images.myImageName.src = 'picture.gif?' + now.getTime();   
 }   
 setTimeout('reloadImage()',10000);
} 
setTimeout('reloadImage()',10000); //-->





Source: http://www.irt.org/script/416.htm