function verifica_login()
 {
  var username = document.login.username.value;
  var parola = document.login.password.value;
   
   if (username == "" )
   {
     alert("    Introduceti Username!    ");
     document.login.username.focus();
     return false;
   }
   
   if (username.length < 4 || username.length > 12)
   {
     alert("    Introduceti corect Username-ul!    ");
     document.login.username.focus();
     return false;
   }
 
   if (parola == "" )
   {
     alert("    Introduceti Parola!    ");
     document.login.password.focus();
     return false;
   } 
   
   if (parola.length < 6 || parola.length > 12)
   {
     alert("    Introduceti corect Parola!      ");
     document.login.password.focus();
     return false;
   } 
  
   return true;

 }