var actfield=true;
var passfield=true;
function checkLogin() {
xmlhttp.open("GET", host+"/dyn/checkLogin.php?visitor_account="+document.forms[0].elements['account'].value+"&visitor_password="+document.forms[0].elements['password'].value,true);
 xmlhttp.onreadystatechange=function() {
  if (xmlhttp.readyState==4) {
    if(xmlhttp.responseText==0)
    {
        document.forms[0].submit();
    }
    else
    {       
alert("Utilisateur inconnu");
        return false;
    }
  }
 }
 xmlhttp.send(null);
}

function clearField(id)
{
if (id==1 && actfield && document.forms[0].elements['account'].value=="Identifiant")
{
document.forms[0].elements['account'].value="";
actfield=false;
}
if (id==2 && passfield && document.forms[0].elements['password'].value=="Mot de passe")
{
document.getElementById("passfield").innerHTML = "<input type=\"password\" name=\"password\" class=\"blue\" value=\"\" onKeyPress=\"return checkEnter(event,1)\">";
setTimeout("document.forms[0].elements['password'].focus()",500);
}
}

function checkEnter(e, formnum){
var characterCode;
if(e && e.which){
e = e;
characterCode = e.which;
}
else{
e = event;
characterCode = e.keyCode;
}

if(characterCode == 13){
if (formnum==1) checkLogin();
return false; 
}
}