如何使用localhost在页面刷新时交换背景图像

我需要能够在页面刷新时交换背景图像。我正试图用javascript做到这一点，我引用了我为页面主体设置的id。以下是我到目前为止想到的，它似乎不起作用:

<script type="text/javascript">
    window.onload = choosePic;
    function choosePic() {
    var myPix = new Array("/CoVPrototype/images/Homepage/skyline_bkgd_blue_fixed.jpg", "/CoVPrototype/images/AboutPage/about_bkgd.jpg", "/CoVPrototype/images/GovernmentPage/gov_bkgd.jpg", "/CoVPrototype/images/newsPage/news_bkgd.jpg", "/CoVPrototype/images/parkPage/park_bkgd.jpg", "/CoVPrototype/images/propertyPage/property_bkgd.jpg", "/CoVPrototype/images/enviroPage/enviro_bkgd.jpg", "/CoVPrototype/images/transportPage/transport_bkgd.jpg", "/CoVPrototype/images/businessPage/business_bkgd.jpg");
    var randomNum = Math.floor(Math.random() * myPix.length);
    document.getElementById("home_style").src = myPix[randomNum];
    }

我在HTML中引用的标签是这样设置的(请注意，所有其他HTML标签都已应用…只是为了简洁，这里没有显示):

<body id="home_style">
</body>

最后，我的CSS是这样的:

body {
        margin:0;
        padding:0;
        font-size:62.5%;
        font-family:"Lucida Sans Unicode", "Lucida Grande", sans-serif;
}
    body#home_style {
            background:no-repeat bottom left fixed;
            width:100%;
    }

这应该工作吗?我做错了什么?!我希望有人能帮忙!!

应该可以:

document.getElementById("home_style").style.backgroundImage = "url(" + myPix[randomNum] + ")";

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