<div style="border:solid silver 1px;padding:5px;"
 onmouseover="this.style.background='#c0c0c0'"
 onmouseout="this.style.background='#ffffff'"   >
    <div style="text-align:center;" >
        <img alt="" src="http://www.dotnethell.it/img/configure.gif"  />
    </div>
    <asp:LinkButton id="btn" runat="server"
    >Aggiungi</asp:LinkButton>
</div>