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<head>
<meta charset="utf-8" />
<title></title>
<script>
onload = function () {
var body = document.getElementsByTagName('body')[0];
var ps = document.getElementsByTagName('p');
var dv = document.createElement('div');
dv.style.width = '100px';
dv.style.height = '100px';
body.appendChild(dv);
dv.style.display = 'none';
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ps[i].onmouseover = function (e) {
dv.style.position = 'absolute';
dv.style.left = e.clientX + 'px';
dv.style.top = e.clientY + 'px';
dv.innerHTML = this.id;
dv.style.display = 'block';
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ps[i].onmouseout = function () {
dv.style.display = 'none';
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<body>
<p id="1">1</p>
<p id="2">2</p>
<p id="3">3</p>
<p id="4">4</p>
<p id="5">5</p>
</body>
</html>