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<html><body><p>This example demonstrates a solution that will work for all browsers.</p><p>This document has an onmousemove event handler attached with the addEventListener() method, that displays a random number every time you move your mouse in this document.</p><p>Click the button to remove the event handler.</p><button onclick="removeHandler()" id="myBtn">Try it</button><p id="demo"></p><script>if (document.addEventListener) { document.addEventListener("mousemove", myFunction);} else if (document.attachEvent) { document.attachEvent("onmousemove", myFunction);}function myFunction() { document.getElementById("demo").innerHTML = Math.random();}function removeHandler() { if (document.removeEventListener) { document.removeEventListener("mousemove", myFunction); } else if (document.detachEvent) { document.detachEvent("onmousemove", myFunction); }}</script></body></html>