if(checked != 1){
    var checked = 0;
}

var nn4 = (document.layers);
var nn6 = (document.getElementById && !document.all);
var ie4 = (document.all && !document.getElementById);
var ie5 = (document.all && document.getElementById);
var op7 = (window.opera && document.createComment) ;
var w3dom = (document.getElementById || op7);
var DHTML = (document.getElementById || document.all || document.layers);

function ap_getObj(name) {
  if (document.getElementById) {
    return document.getElementById(name).style;
  } else if (document.all) {
    return document.all[name].style;
  } else if (document.layers) {
    return document.layers[name];
  }
}

function hide(div, flag)  {
    if (!DHTML)
        return;
    var x = ap_getObj(div);
    x.visibility = (flag) ? 'visible':'hidden'
}