function calendarDiv(id, targetid, previewHTML, flagit) {
    if (flagit) {
        if (document.layers) {
            document.layers[id].visibility = 'show';
            document.layers[id].innerText = document.layers[targetid].innertext; 
        }
        else if (document.all) {
            document.all[id].style.visibility = 'visible';
            document.all[id].innerText = document.all[targetid].innertext; 
        }
        else if (document.getElementById) {
            document.getElementById(id).style.visibility = 'visible'; 
        }
        document.getElementById(id).innerHTML = previewHTML + document.getElementById(targetid).innerHTML;
    }
    else {
        if (!flagit) {
            if (document.layers) {
                document.layers[id].visibility = 'hide'; 
            }
            else if (document.all) {
                document.all[id].style.visibility = 'hidden'; 
            }
            else if (document.getElementById) {
                document.getElementById(id).style.visibility = 'hidden'; 
            }
            document.getElementById(id).innerHTML = '';
        }
    }
}