function right(e)
{
var msg = "Sorry, right clicking is not available.";
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;
       //document.images[i].onmouseup = right;
}