JavaScript to disable cut and paste into form fields

// JavaScript to disable cut and paste into form fields

function cutNPasteNot(evt) {
    document.body.ondrag = function () { return false; };
    document.body.ondrop = function () { return false; };
    document.body.oncopy = function () { return false; };
    document.body.onpaste = function () { return false; };
}