JavaScript Div Hover предупреждает

<!DOCTYPE html>
<html>
<body>
<img onmouseover="bigImg(this)" onmouseout="normalImg(this)" border="0" src="smiley.gif" alt="Smiley" width="32" height="32">
<script>
function bigImg(x) {
 alert("kursor klick")
}
</script>
</body>
</html>
Shadow