var theImages = new Array();
theImages[0] = 'images/affiliates/banner_rpj.gif';
theImages[1] = 'images/affiliates/banner_mr.gif';
theImages[2] = 'images/affiliates/banner_bci.gif';
theImages[3] = 'images/affiliates/banner_ap.gif';

var j = 0;
var p = theImages.length;
var preBuffer = new Array();
for (i = 0; i < p; i++) {
    preBuffer[i] = new Image();
    preBuffer[i].src = theImages[i];
}

var whichImage = Math.round(Math.random() * (p - 1));
var url;
function showImage() {
    switch (whichImage) {
        case 0:
            url = "http://www.rpjministries.org/";
            break;
        case 1:
            url = "http://www.midrangethemovie.com/";
            break;
        case 2:
            url = "http://www.bciedge.com/";
            break;
        case 3:
            url = "http://www.alwayspositive.com/";
            break;
    }
    document.write('<a href="' + url + '" target="_blank"><img src="' + theImages[whichImage] + '" border=0></a>');
}