[devote]

function frUrls(b) {
    var i = 0, c = document.getElementById('main');

    b = b.split(',');

    if (frUrls.intervalHandler) {
        clearInterval(frUrls.intervalHandler);
    }
    frUrls.intervalHandler = setInterval(start, 1000);

    start();

    function start() {
        c.src = b[i++];
        if (i == b.length) {
            i = 0;
        }
    }
}