[Moo] Why is this messing up?

[Chad Meyers]

I had this very simple function to pre load some big header pictures,

function preLoad(){
        img = new Image()
        images = new Array('headerPic-completedProjects.jpg','headerPic-
home.jpg','headerPic-contact.jpg','headerPic-services.jpg')
        for(var i in images){
                img.src = 'images/' + images[i];
        }
}

On the only page I have mooTools and CeraBox loaded it is messing up
with a bunch (39 of them) of 404 errors like this
"GET 
http://www.snairbrothershotrods.ca/images/function%20push()%20{%20%20%20%20[native%20code]}
404 (Not Found)"

can anyone tell me why?  For the time being I just got rid of the
Array, but want to avoid this problem in the future.

Webpage in question is http://www.snairbrothershotrods.ca/completedProjects.php