/**
 * Preload the images for a rotating header
 */

var showImage = (function () {
    var randomImgNum = Math.ceil(Math.random() * 4);

    var getImgSrc = function (num) {
        return '/images/header-' + parseInt(Math.round(num)) + '.jpg';
    };

    return function () {
        document.write('<img src="' + getImgSrc(randomImgNum) + '" />');
    };
}());