function roll(img_name, img_src)
   {
   document[img_name].src = img_src;
   }
   
var message="Function Disabled!";
function clickIE() {if (document.all) {alert(message);return false;}}
function clickNS(e) {if 
(document.layers||(document.getElementById&&!document.all)) {
if (e.which==2||e.which==3) {alert(message);return false;}}}
if (document.layers) 
{document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;}
else{document.onmouseup=clickNS;document.oncontextmenu=clickIE;}