function sprawdzNIP( form ) 
{ 
  var argh = form.k_nip.value.replace(/-/g,""); 
  var arg = argh.replace(/ /g,""); 
  var coefficients = "657234567"; 
  var sum=0; 
  var index=8; 
  for (index=8; index>=0 ;index--)
  { 
    sum += (parseInt(coefficients.charAt(index)) * parseInt(arg.charAt(index)));
  } 
   
   if((sum % 11) == parseInt(arg.charAt(9))) 
    	return true;
   if ( (sum % 11) == 10 ) 
   {
    if (parseInt(arg.charAt(9)) == 0)
    		return true; 
   }
   alert('Podaj prawidłowy numer NIP');
  return false; 
}


function checkNLForm( form ) {
	if ((form.Email.value == "") || (form.Email.value.indexOf ('@') == -1) || (form.Email.value.indexOf ('.') == -1)) {
		alert ('Podaj prawidłowy adres email');
		return false;
	}

	return true;
}