function changeTab(name, id) {
    //tab_ComName_1_text
    //tabBlockContentUnvisible
       
    for(i = 1; d = document.getElementById("tab_" + name + "_" + i); i++) {
        d.className = '';
        e = document.getElementById("tab_" + name + "_" + i + "_text");
        e.className = 'tabBlockContentUnvisible';
    }
    
    d = document.getElementById("tab_" + name + "_" + id);
    d.className = 'selectedTab';
    
    e = document.getElementById("tab_" + name + "_" + id + "_text");
    e.className = 'tabBlockContent';
}