function checkForm( alert_val , bigger_date ) {
  var date1 = document.getElementById('annee_deb').value+document.getElementById('mois_deb').value+document.getElementById('jour_deb').value;
  var date2 = document.getElementById('annee_fin').value+document.getElementById('mois_fin').value+document.getElementById('jour_fin').value;
  if ( date1 > date2)
      alert ( bigger_date );
    else
    {
      var annee_deb = document.getElementById('annee_deb').options[document.getElementById('annee_deb').selectedIndex].value;
      var jour_deb = document.getElementById('jour_deb').options[document.getElementById('jour_deb').selectedIndex].value;
      var mois_deb = document.getElementById('mois_deb').options[document.getElementById('mois_deb').selectedIndex].value;
      var annee_fin = document.getElementById('annee_fin').options[document.getElementById('annee_fin').selectedIndex].value;
      var jour_fin = document.getElementById('jour_fin').options[document.getElementById('jour_fin').selectedIndex].value;
      var mois_fin = document.getElementById('mois_fin').options[document.getElementById('mois_fin').selectedIndex].value;


      var nombre_deb = document.getElementById('nombre_deb').value;
      var montant_deb = document.getElementById('montant_deb').value;

      /*if  (document.getElementById('dividendes').checked) {
        dividendes = true;
      }
      else
      {
        dividendes = '';
      }*/

      var calcul = document.getElementById('calcul').value;
      
      if (!isNumVer3(document.getElementById('nombre_deb')) && !isNumVer3(document.getElementById('montant_deb')))
      {
        alert( alert_val );
        return false ;
      }
      else if (nombre_deb <= 0 && montant_deb <= 0 )
      {
        alert( alert_val );
        return false ;
      }

      else
      {
        document.calc.submit();
      }
    }

}

/*
function chng_selection(objname)
{
  if (objname == 'ACTION')
  {
    document.getElementById('nombre_deb').display = 'hidden' ;
    document.getElementById('montant_deb').display = 'block' ;
    //document.getElementById('montant_deb').value = "" ;
  }
  else
  {
    document.getElementById('nombre_deb').display = 'block' ;
    //document.getElementById('nombre_deb').value = "" ;
    document.getElementById('montant_deb').display = 'hidden' ;
  }

  //radioButtonSelector() ;
}
*/

function check_num(obj)
{
  isNumVer2(obj) ;
}

function radioButtonSelector()
{
  buttonGroup = document.calc.typeselect ;

  alert(buttonGroup.length) ;
  for (var i=0; i< buttonGroup.length; i++)
  {

    if (buttonGroup[i].checked)
    {
      return i
    }
  }
}

function isNumVer2(obj)
{
  var str = obj.value ;

  if (str=="")
  {
    obj.focus();
    obj.value = '';
    return false ;
  }

  for (var i = 0; i < str.length; i++)
  {
    var ch = str.substring(i, i + 1);

    if ((ch < "0" || ch > "9") && (ch != '.'))
    {
      obj.focus();
      obj.value = '';
      return false;
    }

    if (ch == '.' && i==0)
    {
      obj.focus();
      obj.value = '';
      return false;
    }
  }

  return true;
}

function isNumVer3(obj)
{
  var str = obj.value ;

  if (str=="")
  {
    obj.value = '';
    return false ;
  }

  for (var i = 0; i < str.length; i++)
  {
    var ch = str.substring(i, i + 1);

    if ((ch < "0" || ch > "9") && (ch != '.'))
    {
      obj.value = '';
      return false;
    }

    if (ch == '.' && i==0)
    {
      obj.value = '';
      return false;
    }
  }

  return true;
}

function isNum(nombre_deb)
{
  var str = nombre_deb;

  if (str=="")
  {
    document.getElementById('nombre_deb').focus();
    document.getElementById('nombre_deb').value = '';
    return false ;
  }

  for (var i = 0; i < str.length; i++)
  {
    var ch = str.substring(i, i + 1);

    if ((ch < "0" || ch > "9") && (ch != '.'))
    {
      document.getElementById('nombre_deb').focus();
      document.getElementById('nombre_deb').value = '';
      return false;
    }

    if (ch == '.' && i==0)
    {
      document.getElementById('nombre_deb').focus();
      document.getElementById('nombre_deb').value = '';
      return false;
    }
  }

  return true;
}

var clicked = false ;
var selectall = true ;

function cli()
{
  if (clicked==false)
  {
    document.getElementById('nombre_deb').focus();
    document.getElementById('nombre_deb').value = '';
    clicked = true ;
  }
  else
  {
    if (selectall==true)
    {
      document.getElementById('nombre_deb').select();
      selectall = false ;
    }
    else
    {
      selectall = true ;
    }
  }

}

function MM_showHideLayers()
{
  var i,p,v,obj,args=MM_showHideLayers.arguments;

  for (i=0; i<(args.length-1); i+=2)
  {
    if ((obj=MM_findObj(args[i]))!=null)
    {
      v=args[i+1];
      if (obj.style) { obj=obj.style; v=(v=='show')?'':(v='hide')?'none':v; }
      obj.display=v;
    }
  }

  if (navigator.appName == "Microsoft Internet Explorer")
    MM_showHideLayers2(v) ;


}

function MM_showHideLayers2(val)
{

  if (val=="none")
      document.getElementById("dates").style.visibility = "visible" ;
    else
      document.getElementById("dates").style.visibility = "hidden" ;
}