var divs = document.querySelectorAll ('img');
if (divs) {
    for (var i = 0, len = divs.length; i < len; i++) {
        if (divs[i].src.search (/\/\/i(\d+)\.tinypic\.com/) != -1)
            divs[i].src = divs[i].src.replace (/i(\d+)\.tinypic\.com/, 'oi$1.tinypic.com');
        if (divs[i].src.search (/\/\/i(\d+)\.photobucket\.com/) != -1)
            divs[i].src = divs[i].src.replace (/i(\d+)\.photobucket\.com/, 'oi$1.photobucket.com');
    }
}