raphael.js|py and image fallback recipe

gistfile1.js

$('.art').each(function() {
    var el, im, width, height, paper;
    width = $(this).data('width');
    if (width)
        width += 'px';
    height = $(this).data('height');
    if (height)
        height += 'px';
    if (window.Raphael && (Raphael.svg || Raphael.vml)) {
        el = $('<div>').addClass('svg');
        im = IMAGES[$(this).data('vector')];
        $(this).replaceWith(el);
        if (!width)
            width = im.width;
        if (!height)
            height = im.height;
        el.css('width', width);
        el.css('height', height);
        paper = Raphael(el[0], '100%', '100%');
        paper.setViewBox(0, 0, parseFloat(im.width), parseFloat(im.height), true);
        im.fn(paper);
    } else {
        el = $('<img>').attr('src', $(this).data('pixel'));
        $(this).replaceWith(el);
        if (width)
            el.css('width', width);
        if (height)
            el.css('height', height);
    }
});