Problems replacing an asp button with a RadButton

[Felice]

I am experiencing problems replacing a simple asp button with a RadButton.
I need to simply fire a Javascript but it is not working.
This is the original asp button I need to replace:

<button style="width: 150px; margin-bottom: 0px;" onclick="openRadWin(); return false;">Exchange rate calculator</button>

This is the RadButton I am coding to replace the above asp button. 

<telerik:RadButton ID="Button11" runat="server" Text="" CssClass="cNexchange"
                       HoveredCssClass="cHexchange" PressedCssClass="cCexchange" OnClientClicked="openRadWin(); return false;">
                       <Image EnableImageButton="true" />
                   </telerik:RadButton>

I cannot fire the "openRadWin(); return false,"
this is the function:

<script type="text/javascript">
       //<![CDATA[
       function openRadWin() {
           var width = "430px";
           var height = "355px";
           var left = "800px";
           var top = "150px";
           radopen("currencies.aspx", "RadWindow1", width, height, left, top);
       }
       //]]>
   </script>

What am I doing wrong here?

[Princy]

Hi Felice,

Please try the following code snippet which works fine at my end.

ASPX:

<telerik:RadButton ID="btnBgrImg2" runat="server" ForeColor="Black" CssClass="goButtonClassHov"
    OnClientClicked="openRadWin" AutoPostBack="false" Width="100" Height="95px">
    <Image ImageUrl="../Images/globe.jpg" IsBackgroundImage="true"></Image>
</telerik:RadButton>

Thanks,
Princy.

[Felice]

Hi Princy,
thats perfect. Problem solved. Thank you.

Felice