BrowserOK =  (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || 
  ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )));

function ImgPreload(img){
 var a=new Image(); a.src=img; return a; 
 }  
 
function makeon(){
 event.srcElement.style.filter = "gray";
 }
 
function makeout(){
 event.srcElement.style.filter = "";
 } 
  
function gowindow1(str, titolo,w,h) {
 openwin = window.open(str,titolo,'width='+ w +',height='+ h +',status=no,scrollbars=yes,resizable=no,location=no,toolbar=no');
 }

function gowindow(str, titolo,w,h) {
 openwin = window.open(str,titolo,'width='+ w +',height='+ h +',status=no,scrollbars=no,resizable=no,location=no,toolbar=no');
 }