if(document.all&&!document.getElementById){brwsr='ie4'}; /* Internet Explorer 4.x */ 
if(document.all&&document.getElementById){brwsr='ie5'}; /* Internet Explorer 5.0 or higher version */
if(document.layers){brwsr='nn4'}; /*Netscape 4.x */
if(window.sidebar){brwsr='nn6'}; /* Netscape 6.0 or higher */
if(navigator.userAgent.toLowerCase().indexOf('opera')>=0){brwsr='opera'}; /* Opera - any version */ 
//alert(brwsr)
if(brwsr=='opera'){document.location='http://mena-tech.com'};

<!-- Begin
function right(e) {
if (navigator.appName == 'Netscape' && 
(e.which == 3 || e.which == 2))
return false;
else if (navigator.appName == 'Microsoft Internet Explorer' && 
(event.button == 2 || event.button == 3)) {
alert("Sorry, you do not have permission to right click.");
return false;
}
return true;
}

document.onmousedown=right;
document.onmouseup=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (document.layers) window.captureEvents(Event.MOUSEUP);
window.onmousedown=right;
window.onmouseup=right;
//  End -->