function ShowHideBills(elementType, theId) {
    var i;
    if (elementType == "table") {
        // get the id of the table
        var tables = document.getElementsByTagName("table");
        for (i = 0; i < tables.length; i++) {
            if (tables[i].id.indexOf(theId) > -1) {
                    if (document.getElementById(tables[i].id).style.display == "block" 
                    || document.getElementById(tables[i].id).style.display == "") {
                        document.getElementById(tables[i].id).style.display = "none";
                    }
                    else {
                        document.getElementById(tables[i].id).style.display = "block";
                    }
            }
        }
    }
    else {
        // its a label
        if (document.getElementById(theId).style.display == "block" 
        || document.getElementById(theId).style.display == "") {
            document.getElementById(theId).style.display = "none";
        }
        else {
            document.getElementById(theId).style.display = "block";
        }
    }
}