Javascript game

[Fredooo]

Hi guys...
First i have tio say that i am a german guy... so my english isnt the best

Ok my problem is this:

function pushed() 
{ 
keyval=0 
keyval=event.keyCode 
if (keyval==37) { ballmoves[0]=-1; } 
if (keyval==39) { ballmoves[0]=1; } 
score-=1 
if (score<0) score=0 
document.gamefield.scoretxt.value=score 
return; 
}

This code only works in IE and Opera... (netscape i dont know)
But it doesnt work in FireFox...

Can someone explain me why?
I know that Firefox interpret

event.keycode
as
Event.keycode

but how can i put in a "switch"
so that the game is playable at all Browser?!

PLz can someone help me?!
THX Fredooo

[Bob90]

Just add the argument 'event' to the function.

function pushed(event) 
{ 
keyval=0 
keyval=event.keyCode 
if (keyval==37) { ballmoves[0]=-1; } 
if (keyval==39) { ballmoves[0]=1; } 
score-=1 
if (score<0) score=0 
document.gamefield.scoretxt.value=score 
return; 
}

[mburt]

Gecko browsers (FireFox, Safari) depend an argument for these things, oftenly referred to as "e":

function pushed(e) 
{ 
var events = e || event;
var keyval = events.keyCode;
if (keyval==37) { ballmoves[0]=-1; } 
if (keyval==39) { ballmoves[0]=1; } 
var score = -1; 
if (score<0) score=0 
document.gamefield.scoretxt.value=score 
return; 
}

Using the "var" keyword is necessary as well.