function showhide(divid, state){
document.getElementById(divid).style.display=state
}
function showhide2(divid1, state1, divid2, state2, divid3, state3){
document.getElementById(divid1).style.display=state1
document.getElementById(divid2).style.display=state2
document.getElementById(divid3).style.display=state3
}
function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }