I don't know why it's simply not working! <input type=submit class=buton value="Enabled" onclick="igor();" name="idlogin" id="idlogin"> <script language="JavaScript"> <!-- function igor(){ alert('step one ok'); document.GetElementByID('idlogin').value='Disabled!!'; document.GetElementByID('idlogin').disabled=true; alert('streop 2 ok'); } --> </script>