function toggleVisability(theBlockId) {
    var theBlock = document.getElementById(theBlockId);
    if (theBlock.style.display=='') {
        theBlock.style.display='none';
    } else {
        theBlock.style.display='';
    }
}
function makeVisable(theBlockId) {
    var theBlock = document.getElementById(theBlockId);
    theBlock.style.display='';
}