Exercice JavaScript Inscription

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Exercice 2</title>
<style type="text/css">
<!--
.style1 {
    font-size: 40px;
    font-weight: bold;
}
.style2 {
    font-size: 18px;
    font-weight: bold;
}
-->
</style>
<script language="javascript">
function verif () {
    np=f.T1.value;
    email=f.T2.value;
    mp=f.T3.value;
    if (np=='' || email=='' || mp=='' )
    {
        alert ("L'un des champs est vide");
        return false
    }
    alphamaj='AZERTYUIOPQSDFGHJKLMWXCVBN';
    alphamin=alphamaj.toLowerCase();
    num='1234567890';
    sommenum=-1;
    sommemin=-1;
    sommemaj=-1;
    r=np.toUpperCase();
    for (i=0;i<=np.length;i++)
    {
        car=r.charAt(i);
        if (alphamaj.indexOf(car)==-1)
        {
            alert ('Le champs contient un nombre');
            return false;
        }
    }
    if (email.indexOf('@')==-1 || email.indexOf('.')==-1 || email.indexOf('@')>email.indexOf('.') )
    {
        alert ('Le champ email est invalide');
        return false;
    }
        for (i=0;i<=mp.length;i++)
        {
            car=mp.charAt(i);
            if (alphamin.indexOf(car)!=-1)
            {
                sommemin=sommemin+1;
            }
            if (num.indexOf(car)!=-1)
            {
                sommenum=sommenum+1;
            }
            if (alphamaj.indexOf(car)!=-1)
            {
                sommemaj=sommemaj+1;
            }
        }
    if (sommemaj==0 || sommemin==0 || sommenum==0)
    {
        alert ("Le mot de passe n'est pas assez fort");
        return false;
    }
}
</script>
</head>

<body>
<p class="style1">INSCRIPTION</p>
<form id="f" name="form1" method="post" action="remerciement.html">
  <table width="586" height="273" border="0">
    <tr>
      <td colspan="2"><span class="style2">Donn&eacute;es personnelles</span></td>
    </tr>
    <tr>
      <td width="252">Nom Pr&eacute;nom</td>
      <td width="324"><label>
        <input name="T1" type="text" id="T1" size="40" />
      </label></td>
    </tr>
    <tr>
      <td height="37">Date de naissance </td>
      <td><label>Jour
        <select name="L1" id="L1">
        </select>
      Mois
      <select name="L2" id="L2">
      </select>
      Ann&eacute;e
      <select name="L3" id="L3">
      </select>
      </label></td>
    </tr>
    <tr>
      <td colspan="2"><span class="style2">Donn&eacute;es de Connexion</span></td>
    </tr>
    <tr>
      <td>Email</td>
      <td><input name="T2" type="text" id="T2" size="40" /></td>
    </tr>
    <tr>
      <td>Mot de passe</td>
      <td><input name="T3" type="password" id="T3" size="40" /></td>
    </tr>
    <tr>
      <td colspan="2"><label>
        <input type="submit" name="B1" value="S'inscire" onclick="return verif()" />
      </label>
        <label>
        <input type="reset" name="B2" value="Annuler" />
      </label></td>
    </tr>
  </table>
  <script language="javascript">
    for (i=0;i<31;i++)
        {
            b=String(i+1);
            ob=new Option (b,'');
            f.L1.options[i]=ob;
        }
    r=0;
    for (i=1989;i<2020;i++)
        {
            b=String(i+1);
            ob=new Option (b,'');
            f.L3.options[r]=ob;
            r=r+1;
        }
        d=new Option('Janvier','');
        f.L2.options[0]=d;
        d=new Option('février','');
        f.L2.options[1]=d;
        d=new Option('mars','');
        f.L2.options[2]=d;
        d=new Option('avril','');
        f.L2.options[3]=d;
        d=new Option('mai','');
        f.L2.options[4]=d;
        d=new Option('juin','');
        f.L2.options[5]=d;
        d=new Option('juillet','');
        f.L2.options[6]=d;
        d=new Option('août','');
        f.L2.options[7]=d;
        d=new Option('septembre','');
        f.L2.options[8]=d;
        d=new Option('octobre','');
        f.L2.options[9]=d;
        d=new Option('novembre','');
        f.L2.options[10]=d;
        d=new Option('décembre','');
        f.L2.options[11]=d;
  </script>
  <p class="style2">&nbsp;</p>
  <p class="style2">&nbsp;</p>
</form>
<p class="style2">&nbsp;</p>
<p>&nbsp;</p>
</body>
</html>