window.onload = function(){
var weaponShowcases = document.getElementsByClassName("weaponShowcase");
var length = weaponShowcases.length;

for(var i = 0; i < length; i++){
    (function(i){
        var selectBoxes = weaponShowcases[i].getElementsByClassName("weaponSelectbox");
        var weaponImage = weaponShowcases[i].getElementsByClassName("weaponShowcaseImage")[0];

        var length = selectBoxes.length;
        for(var j = 0; j < length; j++){
            var preLoadImage = new Image(); //used to pre-load images
            preLoadImage.src ="http://minimum.gamepedia.com/Special:FilePath/"+wgPageName+(j+1)+".png";
            (function(j){
                selectBoxes[j].onmouseover = function(){weaponImage.src="http://minimum.gamepedia.com/Special:FilePath/"+wgPageName+(j+1)+".png";};
            })(j);
        }
    })(i);
};
};