Software :: Chromium Loading Extension With Javascript Code?

I'm trying to make an extension that hopefully will remove the space bar scroll down function. So I've googled a bit and I've found this codes, that I've stored in a spacebar.js file

Code:
window.onkeydown=function(e){
if(e.keyCode==32){
return false;
}
};

Now for an extension to be valid so chromium would accept it I observed it needs a manifest.json file as in this tutorial [URL].. .So I've figured it out it should look something like this

[Code]...

The thing it's when I try to load unpacked extension in chromium I get a syntax error at line 6 column 7. Now I have to admit I'm not so good at scripting so anybody has any idea in how to fix this ?