browserName        = navigator.appName 
browserVersion      = parseInt(navigator.appVersion) 

document.onmousedown = checkforRightMouseButtonClick; 
if (browserVersion<5 && browserName=="Netscape") 
{ 
    window.onmousedown = checkforRightMouseButtonClick; 
} 

function rightClickPressed() 
{ 
   alert("Esis Power!"); 
} 

function checkforRightMouseButtonClick(mouseEvent) 
{ 
if ( ((browserName=="Microsoft Internet Explorer") && (event.button >1)) || 
       ((browserName=="Ne tscape") && (mouseEvent.which > 1)) ) 
    { 
      rightClickPressed() 
      return false; 
    } 
else 
   return true; 
}