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Simple javascript not working in Firefox

Can anybody tell me why this simple example works fine in IE, Chrome, Safari, and Opera but not in FireFox?

Thanks!

HTML:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication8.WebForm1" %>

<!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 runat="server">
    <title></title>
</head>
<body id="body">
<script type="text/javascript">
    function setHover(id, color) {
       if(id != "") {
         var buttonName = document.getElementById(id.id);
         buttonName.style.backgroundColor = color;
        }
    }
 </script>
    <form id="form1" runat="server">
    <div id ="test">
        <asp:Button ID="Button1" runat="server" Text="Button" />
    </div>
    </form>
</body>
</html>

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CodeBehind

public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Button1.Attributes.Add("onmouseover", "setHover(window.event.srcElement, 'Red');");
        }
    }

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