function Choix(form) {
i = form.Categories.selectedIndex;
if (i == 0) {
return;} 
switch (i) {
case 1 : var txt = new Array ('Spider-Man Unlimited','Surfer d\'Argent','Avengers'); ligne=3; break;
case 2 : var txt = new Array ('X-Men','Spider-Man','Les Quatre Fantastiques','Iron-Man','Hulk'); ligne=5; break;
case 3 : var txt = new Array ('X-Men : Evolution','Spider-Man MTV','Les Quatre Fantastiques','Spectacular Spider-Man','Wolverine & The X-Men','Iron Man : Armored Adventures','Hulk : Gamma Corps','Black Panther','SuperHero Squad'); ligne=9; break;
case 4 : var txt = new Array ('Ultimate Avengers','Ultimate Avengers 2','The Invincible Iron-Man','Doctor Strange','Next Avengers : Heroes of Tomorrow','Hulk Vs Wolverine','Thor : Tales of Asgard'); ligne=7; break;
}
form.Categories.selectedIndex = 0+i;
for (i=0;i<ligne;i++) {
form.Series.options[i+1].text=txt[i];
}
}