js: preload images

preloadImages.js

function preloadImages(srcs) {
        if (!preloadImages.cache) {
            preloadImages.cache = [];
        }
        var img;
        for (var i = 0; i < srcs.length; i++) {
            img = new Image();
            img.src = srcs[i];
            preloadImages.cache.push(img);
        }
    }
    // then to call it, you would use this
    var imageSrcs = [];
    setTimeout(function() {
        imageSrcs.push("/siteImg/lb-mugs-large.jpg");
        preloadImages(imageSrcs);
    }, 1000);