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var message = "function disabled"; function rtclickcheck(keyp){ if (navigator.appName == "Netscape" && keyp.which == 3){ alert(message); return false; } if (navigator.appVersion.indexOf("MSIE") != -1 && event.button == 2) { alert(message); return false; } } document.onmousedown = rtclickcheck; src="http://static.tumblr.com/8jq17g7/Re3lqefyw/install.png" />