[Wolf1994]

You need server side scripting for your goal.

PHP Code:

$max=10;//quantity of images



$fp=fopen ("img.txt", "r");

$n=fread ($fp)+1;

if ($n>$max)

 $n=1;

fclose ($fp);



$fp=fopen ("img.txt", "w");

fwrite ($fp, $n);

fclose ($fp);



print '<img src="pic'.$n.'.gif" />'; 

This script will show images from "pic1.gif" till "pic10.gif", by round.