var $ = document.getElementById;
Array.prototype.RndWrite = function() {
    document.write(this.sort(function() { return Math.random() > 0.5 ? -1 : 1; }).join(''));
}

function hover(o) {
    var color = o.bgColor;
    switch (color) {
        case '#ffff00':
            o.bgColor = ''
            break;
        default:
            o.bgColor = '#ffff00'
    }
    if (!o.onmouseout) {
        o.onmouseout = function() { this.bgColor = color }
    }

}