function testemail(email,message) {
 var test1 = false;
 var test2 = false;
 var test = false;
 for (i=0;i<email.length;i++) { 
   var a = email.charAt(i);
   if (a=="@") test1 = true; 
   }  
 for (i=0;i<email.length;i++) { 
   var a = email.charAt(i);
   if (a==".") test2 = true; 
   }
  test = test1 & test2;
  if (!test) alert(email+message);
  return test;
}


function validevalue(valeur,message) {
  if (!parseFloat(valeur)) { alert(message); return false };
  return true;
}


function validesize(valeur,mini,message) {
 if (valeur.length+1 > mini ) return true;
 alert(message);
 return false;
}