Dynamic content not loading in FF

1

Hi,
i have a curious problem with dynamically generated flash content in FireFox. You can view the site under http://www.kenvelo.mmfilm.sk. If you go into the deepest category of the dropdown menue, to the prodcuts browser, there is a strange issue with the content. In IE everything works fine, but in FF, if you change the product (select a different product from the list to the left), nothing happens.
The content ist generated dynamically from the library on hand of some data loaded from a PHP server-side script. The code that loads the data follows:


lan_init_object = new XML();
lan_init_object.ignoreWhite = true;
lan_init_object.onLoad = function (ok)
{
    if (ok)
    {
        .....script that generates the content........
    }
}
tmp = myRandom();
loader = new LoadVars();
loader.cachecommand = 'bypass';
loader.seed = Math.round(Math.random()*500);
loader.sendAndLoad(_global.site+"webapi/site_category_detail."+_global.webapi_extension+"?main_cat="+_global.main_cat+"&sub_cat="+_global.sub_cat+"&sub_cat2="+_global.sub_cat2+"&tmp="+tmp,lan_init_object,"GET"); // i've tryed POST also, no effect
//lan_init_object.load(_global.site+"webapi/site_category_detail."+_global.webapi_extension+"?main_cat="+_global.main_cat+"&sub_cat="+_global.sub_cat+"&sub_cat2="+_global.sub_cat2+"&tmp="+tmp);

In my opinion, the statements that should be executed on load don’t get executed for some reason in FireFox. I have figured out that there is a problem with the browser cache in FF, so that’s why we have implemented the random parameters to the URL, unfortunately with no effect. The server-side script also sends correct headers for content-type.
Now let’s not forget that this same method is used to load the initial data the product_browser displays - and, wow - this displays in FF too. The embed is a normal SWF.Object embed, nothing modifyed, the change_product function does not invoke any SWF.Address changes that could explain this behaviour.
Im working in Flash for some time now, but this is new and strange at same time for me. Can someone maybe gime a tip for this?
Thanx really much, Michael