currenta3 = "NI";
function tTab(tb) {

    if (currenta3 != tb) {

        document.getElementById('con_' + tb).style.display = 'block';
        document.getElementById('con_' + currenta3).style.display = 'none';

        document.getElementById('tab_' + tb).className = 'tab activetab';
        document.getElementById('tab_' + currenta3).className = 'tab';

        currenta3 = tb;

    }

}