function non(clic) {
if (navigator.appName == 'Netscape' && clic.which==3) {
open_window();
return false;}
else
if ((navigator.appName == 'Microsoft Internet Explorer' && event.button==2)||(navigator.appName == 'Opera' && event.button==2)) {
open_window();
return false;
}
return true;
}
document.onmousedown = non;