<!--
    function kontrola() {
    
      if (document.form_mailist.email.value == "") {
         // jeśli nic nie wpisał
         alert("Aby się zapisać wpisz swój adres e-mail !");        
document.form_mailist.email.focus(); 
	// if the browser is Netscape 6 or IE
	if(document.all || document.getElementByID){
	// change the color of text field
	document.form_mailist.email.style.background = "yellow";
	}
	// make sure the form is not submitted
	return false;     
      }
      // czy jest znak '@';
      email_e = document.form_mailist.email.value;
      dlugosc_e = document.form_mailist.email.value.length;
      jest = 0;
     
       for(crt=0;crt<=dlugosc_e;crt=crt+1) {
        if (email_e.substring(crt,crt+1) == "@") {
         jest++;
        } 
       }
       if (jest != 1) {
         alert("Wpisz poprawny adres e-mail !");       
document.form_mailist.email.focus(); 
	// if the browser is Netscape 6 or IE
	if(document.all || document.getElementByID){
	// change the color of text field
	document.form_mailist.email.style.background = "yellow";
	}
	// make sure the form is not submitted
	return false;     
         return false;
}
if(document.form_mailist.pp.checked==false ){
alert("Musisz zgodzić się z Polityk± Prywatno¶ci !");
document.form_mailist.pp.focus(); // put the prompt in the name field 
// if the browser is Netscape 6 or IE
if(document.all || document.getElementByID){
// change the color of text field
document.form_mailist.pp.style.background = "yellow";
}
// make sure the form is not submitted
return false;
       }
      }
//-->