// numeric only input
//function isNumberKey(evt) {
    //var charCode = (evt.which) ? evt.which : event.keyCode
    //if (charCode > 31 && (charCode < 48 || charCode > 57))
        //return false;

    //return true;
//}

// toggle a container
function unhide(divID) {
    hideAllCategories();
    var item = document.getElementById(divID);
    if (item) {
        item.className = (item.className == 'cathidden') ? 'catunhidden' : 'cathidden';
    }
}

// toggle a container
function unhide1(divID) {
    var item = document.getElementById(divID);
    if (item) {
        item.className = (item.className == 'hidden') ? 'unhidden' : 'hidden';
    }
}

// hide a container
function hide(divID) {
    var item = document.getElementById(divID);
    if (item) { item.className = 'cathidden'; }
}

function hideAllCategories() {
    hide('CatA');
    hide('CatB');
    hide('CatC');
    hide('CatD');
    hide('CatE');
    hide('CatF');
    hide('CatG');
    hide('CatH');
    hide('CatI');
    hide('CatJ');
    hide('CatK');
    hide('CatL');
    hide('CatM');
    hide('CatN');
    hide('CatO');
    hide('CatP');
    hide('CatQ');
    hide('CatR');
    hide('CatS');
    hide('CatT');
    hide('CatU');
    hide('CatV');
    hide('CatW');
    hide('CatX');
    hide('CatY');
    hide('CatZ');
    return true;
}