changetable = function(id, action) {
       if (action=="hide") {
            document.getElementById(id).className = "hidden";
       } else {
            document.getElementById(id).className = "manytables";
       }
};
changeblock = function(id, action) {
       if (action=="hide") {
            document.getElementById(id).className = "hidden";
       } else {
            document.getElementById(id).className = "unhidden";
       }
};