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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<div id="a" style="height:100px; width:100px; background:#fff"></div>
</body>
</html>
<script type="text/javascript">
function changeBgColor(element) {
alert(element.style.backgroundColor);
if (element.style.backgroundColor == "#123456") {
element.style.backgroundColor = "#111111";
} else {
element.style.backgroundColor = "#222222";
}
}
window.onload = function () {
changeBgColor(document.getElementById("a"));
}
</script>