var NS4 = (document.layers) ? true : false;
var IE4 = (document.all)    ? true : false;

var strURL, results, iequal;

strURL = "" + window.location;
iequal = strURL.lastIndexOf("=");
results = 0;
if(iequal >= 0) {
  results = Number(strURL.substr(iequal + 1));
  //showlevel(results);
}

function gonext(objForm, nra, nextURL) {
  with(objForm) {
    if(!a[0].checked && !a[1].checked && !a[2].checked && !a[3].checked) {
      alert("Choisissez la reponse!");
	  a[0].focus();
	  return;
    }
    if(isNaN(results)) results = 0;
    if(a[nra].checked) {results++}
  }
  window.location = nextURL + "?rst=" + results;
}