ASP.NET ImageButton and OnMouseOver

// initialize imagebutton            aboutusImageButton.Attributes.Add("OnMouseOver", "this.src='images/res/aboutusbs.png';");            aboutusImageButton.Attributes.Add("OnMouseOut", "this.src='images/res/aboutusb.png';");

<asp:ImageButton ID="aboutusImageButton" runat="server" Width="200px" Height="40px"                                 ImageUrl="~/images/res/aboutusb.png" onclick="aboutusImageButton_Click" />

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