asp:Imagebutton rollover image

how do i setup a rollover image for a.gif -> a1.gif

<asp:ImageButton ID="btn" AlternateText="rollover" ImageUrl="images/a.gif" runat="server" />

Quote:

---

Originally Posted by john83

how do i setup a rollover image for a.gif -> a1.gif

---

Code:

---

<asp:ImageButton ID="btn" onmouseover="images/a1.gif" onmouseout="images/a.gif" AlternateText="rollover" ImageUrl="images/a.gif"  runat="server" />

---