var DT_numberOfTabs = -1;
function DT_switchTab(tabIndex){

    if (DT_numberOfTabs == -1) {
        DT_setNumberOfTabs();
    }

    if (document.getElementById) {
        for (var f = 0; f < DT_numberOfTabs; f++) {
            if (document.getElementById('tabContentBlock'+f)) {
                document.getElementById('tabContentBlock'+f).style.display='none';
                document.getElementById('tabItem'+f).className = 'tabItem';
                document.getElementById('tabItem'+f).blur();
            }
        }
        // active tab
        if (document.getElementById('tabContentBlock'+tabIndex)) {
            document.getElementById('tabItem'+tabIndex).className ='tabItemSelected';
            document.getElementById('tabContentBlock'+tabIndex).style.display='block';
        }
    }
}

function DT_setActiveTab(tabIndex) {
    if (!tabIndex) {
        DT_switchTab(0);
    } else {
        DT_switchTab(tabIndex);
    }
}

function DT_setNumberOfTabs() {
    if (document.getElementById) {
        var loopContinue = true;
        DT_numberOfTabs = 0;
        while (loopContinue) {
            if (!document.getElementById('tabContentBlock'+DT_numberOfTabs)) {
                loopContinue = false;
            } else {
                DT_numberOfTabs++;
            }
        }
    }
}