Disable back button using javascript

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For disabling the back button functionality in the browser
Use this code on the master page

 <script type="text/javascript">
function noBack() {
window.history.forward()
}
noBack();
window.onload = noBack;
window.onpageshow = function (evt) { if (evt.persisted) noBack() }
window.onunload = function () { void (0) }
</script>

 In this code using the <head> --script--</head>

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