function MM_goToURL() { //v3.0
 var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
 for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
} 

function otworz(theURL,winName,features) {
  window.open('vat.htm','Odliczenie_VAT','width=520,height=620,scrollbars=yes');
}

function otworz2(theURL,winName,features) {
  window.open('catering_form.php','Formularz','width=400,height=500');
}

function otworz3(theURL,winName,features) {
  window.open('sala.htm','Odliczenie_VAT','width=520,height=620,scrollbars=yes');
}

function szczegoly(theURL,winName,features) {
  window.open(theURL,'Szczegoly','width=400,height=500');
}