function NextSibling(startBrother) {
    endBrother = startBrother.nextSibling;
    while (endBrother.nodeType != 1) {
        endBrother = endBrother.nextSibling;
    }
    return endBrother;
}
function PrevSibling(startBrother) {
    endBrother = startBrother.previousSibling;
    while (endBrother.nodeType != 1) {
        endBrother = endBrother.previousSibling;
    }
    return endBrother;
}