function f1() {
         fenetre=window.open("map1.htm","fenetre1","width=602,height=505,left=200,top=100");
}

function f2() {
         fenetre=window.open("map2.htm","fenetre1","width=401,height=321,left=300,top=200");
}


function checkMail (str) { 
  var reg = new RegExp("[a-zA-Z0-9\\-_\\.]{1,}@[a-zA-Z0-9\\-_]{2,}\\.[a-z]{2,}");
  return reg.test(str); 
} 


function checkForm (nom_form, nom_champ) {

  if (!checkMail(document.forms[nom_form].elements[nom_champ].value)) {
    alert("Indirizzo e-mail non coretto !"); 
    return false; 
  } 
  return true;
}