Problemer med FireFox,Layers og OnMouseOver

Hej derude.

Dette er mit livs 3 forsøg med programmering - og jeg vil sige at jeg har kunnet finde mange rigtig gode svar herinde undervejs. Kudos til jer :)
I min mangel på erfaring med browse-typer er jeg vist kommet rigtig galt afsted nu.

Nedenstående virker fint i IE - men i Firefox virker kun 1. og 6.billede (???????) - og tiltrods for lang tids søgning, kan jeg ikke få reddet mig ud af "suppedasen" :
I et lag ligger en række billeder, der dels skifter billedet i et
andet billedlag, og gerne samtidig skulle show/hide en række tekstlag:
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<div id="Imagelayer" style="position:absolute; z-index:2;" class="Imagelayer" ><img src="images/Fishing_Medium2%20.gif" name="FishBoyL" width="378" height="266"id="FishBoyL"></div>
<div id="Imageband" style="position:absolute; left:313px; top:439px; width:460px; height:56px; z-index:1" class="ImageBand"><img src="images/fishingBoy_Small%20.gif" name="FishboyS" width="66" height="48" id="FishboyS" onMouseOver="MM_swapImage('FishBoyL','','images/Fishing_Medium2%20.gif',1);MM_showHideLayers('Fishing','','show','Bike','','hide','Shop','','hide','Cave','','hide','Hike','','hide','Golf','','hide','Ski','','hide','Beach','','hide')" onbeforeunload="MM_showHideLayers('Fishing','','show','Bike','','hide','Shop','','hide','Cave','','hide','Hike','','hide','Golf','','hide','Ski','','hide','Beach','','hide')"><img src="images/Bike_Small2.gif" name="BikeS" width="48" height="48" id="BikeS" onMouseOver="MM_swapImage('FishBoyL','','images/Bicycle_Medium2%20.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','show','Shop','','hide','Cave','','hide','Hike','','hide','Golf','','hide','Ski','','hide','Beach','','hide')"><img src="images/Shopping%20_%20Small.gif" name="ShopS" width="66" height="48" id="ShopS" onMouseOver="MM_swapImage('FishBoyL','','images/Shopping_Medium2%20.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','hide','Shop','','show','Cave','','hide','Hike','','hide','Golf','','hide','Ski','','hide','Beach','','hide')"><img src="images/Cave_Small2.gif" name="CaveS" width="48" height="48" id="CaveS" onMouseOver="MM_swapImage('FishBoyL','','images/Cave_Medium2.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','hide','Shop','','hide','Cave','','show','Hike','','hide','Golf','','hide','Ski','','hide','Beach','','hide')"><img src="images/Hiking2_Smal.gif" name="HikeS" width="66" height="48" id="HikeS" onMouseOver="MM_swapImage('FishBoyL','','images/Hike_Medium2.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','hide','Shop','','hide','Cave','','hide','Hike','','show','Golf','','hide','Ski','','hide','Beach','','hide')"><img src="images/Beach_Small2.gif" name="BeachS" width="48" height="48" id="BeachS" onMouseOver="MM_swapImage('FishBoyL','','images/Beach_Medium2.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','hide','Shop','','hide','Cave','','hide','Hike','','hide','Golf','','hide','Ski','','hide','Beach','','show')"><img src="images/skiing1_Small%20.gif" name="SkiS" width="66" height="48" id="SkiS" onMouseOver="MM_swapImage('FishBoyL','','images/Skiing_Medium2.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','hide','Shop','','hide','Cave','','hide','Hike','','hide','Golf','','hide','Ski','','show','Beach','','hide')"><img src="images/Golf_Small2.gif" name="GolfS" width="48" height="48" id="GolfS" onMouseOver="MM_swapImage('FishBoyL','','images/Golf_Medium2.gif',1);MM_showHideLayers('Fishing','','hide','Bike','','hide','Shop','','hide','Cave','','hide','Hike','','hide','Golf','','show','Ski','','hide','Beach','','hide')"></div>
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Hele siden kan se på "www.bsky.dk"
Jeg håber meget at en af jer kan hjælpe mig videre.