function right(e) {
var msg = "Sorry, you can't download image.";
if (navigator.appName == 'Netscape' && e.which == 3) {
alert(msg);
return false;
}
if (navigator.appName ==
'Microsoft Internet Explorer' && event.button==2) {
alert(msg);
return false;
}
else return true;
}

function trap() {
if(document.images)
for(i=0;i<document.images.length;i++)
document.images[i].onmousedown = right;
}