CSS list trouble

Netscape renders the following code differently than Explorer and Opera. Any suggestions or explanations welcome!
I won't say anything about the italics not showing up in Opera, or the variable spacing between bullets and text. Maybe pixel-perfect is not the way to go... ; )

French - français! Le code ci-dessous donne les résultats affichés pour les différents navigateurs. Cherchez l'erreur - c'est surtout Netscape qui m'embête.

UL LI
{
   margin: 1px 0px 0px 10px;
   list-style-image: url(/img/bullet.gif);
   padding: 0px;
}

UL
{
   margin: -7px 0px 0px 0px;
   padding: 0px;
}

Here are screenshots of the results:

Internet Explorer 5.5

Internet Explorer

Opera 5.0

Opera

Netscape 6.0

Netscape

::: discussion :::

This site will look much more pretty in a browser which supports web standards, but it is accessible to any browser or Internet device. Browsers which do not support CSS will get this message, even if they are otherwise standards-compliant. Do you want to upgrade?

French - français! Ce site aura l'air bien plus joli dans un navigateur conforme aux standards du web, mais il est accessible avec n'importe quel navigateur ou dispositif Internet. Désirez-vous faire une mise à jour?