Panels with frame="true" has extra padding on top and bottom in IE7 but not in FF3. 

            <ext:Panel ID="Panel1" runat="server" Collapsible="true" Title="Title" Frame="true" >
                <Content>
                    adsadsa
                </Content>
            </ext:Panel>
            <ext:Panel ID="Panel2" runat="server" Collapsible="true" Title="Title" Frame="true">
                <Content>
                    adasdsa
                </Content>
            </ext:Panel>