function switchTag(tag, content, tagCount) {

    for (i = 1; i <= tagCount; i++) {
        if ("tag" + i == tag) {
            document.getElementById(tag).getElementsByTagName("a")[0].className = "selectli";
            document.getElementById(tag).getElementsByTagName("a")[0].getElementsByTagName("span")[0].className = "selectspan";
        } else {
            document.getElementById("tag" + i).getElementsByTagName("a")[0].className = "";
            document.getElementById("tag" + i).getElementsByTagName("a")[0].getElementsByTagName("span")[0].className = "";
        }
        if ("content" + i == content) {
            document.getElementById(content).className = "blockcontent";
        } else {
            document.getElementById("content" + i).className = "hidecontent";
        }
    }
}