function Validar(form)
{
   
   if (form.username.value.length < 5)
   { alert("Username must have between 5 and 15 characters"); form.username.focus(); return; }
   
   if (form.username.value.length > 15)
   { alert("Username must have between 5 and 15 characters"); form.username.focus(); return; }
			
    form.submit();

}