//---ここから
function disableRightClick(e)
{
 if(!document.rightClickDisabled) // initialize
 {
   if(document.layers)
   {
     document.captureEvents(Event.MOUSEDOWN);
     document.onmousedown = disableRightClick;
   }
   else document.oncontextmenu = disableRightClick;
   return document.rightClickDisabled = true;
 }
 if(document.layers || (document.getElementById && !document.all))
 {
   if (e.which==2||e.which==3)
   {
     return false;
   }
 }
 else
 {
   return false;
 }
}
//---ここまで