Bookmarklet to add an element to the page which displays cursor coordinates

cursor.js

javascript:(function() {
    var div = document.createElement('div');
    div.style.cssText = 'position:fixed;bottom:10px;right:10px;padding: 4px 8px;border: 1px solid black;z-index:99';
    document.body.appendChild(div);
    document.onmousemove = function(e) {
        div.innerHTML = e.clientX + ' : ' + e.clientY;
    };
})();