function bbCode(tArea, tag1, tag2) {
    if(document.selection) { /* Internet Explorer */
        tArea.focus();
        var sel = document.selection.createRange();
        sel.text = tag1 + sel.text + tag2;
    } else { /* Firefox */
        var len = tArea.value.length;
        var start = tArea.selectionStart;
        var end = tArea.selectionEnd;
        var sT = tArea.scrollTop;
        var sL = tArea.scrollLeft;
        var sel = tArea.value.substring(start, end);
        var rep = tag1 + sel + tag2;
        tArea.value = tArea.value.substring(0, start) + rep + tArea.value.substring(end, len);
        tArea.scrollTop = sT;
        tArea.scrollLeft = sL;
    }
}