function CheckBrowser() { 
    if (browser.isIE55 || browser.isIE6up)  
        return 0; 
    else    
        alert("Best view with Microsoft Internet Explorer 6.x"); 
} 

//questa disabilita il tasto dx
function DisableDx() { 
    //document.oncontextmenu = nocontextmenu;
    //document.onmousedown = norightclick;
    //if (window.Event) document.captureEvents(Event.MOUSEUP);
    //return 0; 
}