http://mikekappel.com/examples/VB/CustomControls/Image.vb

I am trying to figure out why the postback event does not fire. Anyone
know?

Imports Microsoft.VisualBasic
Imports System.Web.UI

    ''' <summary>
    ''' MikeImage is a Javascript enabled Custom Control
    ''' Automatic Javascipt Rollovers
    ''' </summary>
    ''' <remarks></remarks>
    Public Class MikeImage
        Inherits Image
        Implements IPostBackEventHandler

        ''' <summary>
        ''' Define the Click event.
        ''' </summary>
        ''' <remarks></remarks>
        Public Event Click As EventHandler

        ''' <summary>
        ''' Invoke delegates registered with the Click event.
        ''' </summary>
        ''' <param name="e"></param>
        ''' <remarks></remarks>
        Protected Overridable Sub OnClick(ByVal e As EventArgs)
            RaiseEvent Click(Me, e)
        End Sub

        ''' <summary>
        ''' Url of the Rollover image
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property ImageUrlOver() As String
            Get
                Return _ImageUrlOver
            End Get
            Set(ByVal value As String)
                _ImageUrlOver = value
            End Set
        End Property
        Private _ImageUrlOver As String = ""

        ''' <summary>
        ''' Javascript OnMouseOver Event
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property OnClientMouseOver() As String
            Get
                Return _OnClientMouseOver
            End Get
            Set(ByVal value As String)
                _OnClientMouseOver = value
            End Set
        End Property
        Private _OnClientMouseOver As String = ""

        ''' <summary>
        ''' Javascript OnMouseOut Event
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property OnClientMouseOut() As String
            Get
                Return _OnClientMouseOut
            End Get
            Set(ByVal value As String)
                _OnClientMouseOut = value
            End Set
        End Property
        Private _OnClientMouseOut As String = ""

        ''' <summary>
        ''' Javascript OnClick Event
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property OnClientClick() As String
            Get
                Return _OnClientClick
            End Get
            Set(ByVal value As String)
                _OnClientClick = value
            End Set
        End Property
        Private _OnClientClick As String = ""

        ''' <summary>
        '''
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property HRef() As String
            Get
                Return _HRef
            End Get
            Set(ByVal value As String)
                _HRef = value
            End Set
        End Property
        Private _HRef As String = ""

        ''' <summary>
        ''' Loads Javascript into Image HTML markup
        ''' </summary>
        ''' <param name="e"></param>
        ''' <remarks></remarks>
        Protected Overrides Sub OnPreRender(ByVal e As
System.EventArgs)
            OnClientClick +=
Me.Page.ClientScript.GetPostBackEventReference(Me, "Click")

            If ImageUrlOver <> "" Then OnClientMouseOver =
"this.src='" + ImageUrlOver + "';" + OnClientMouseOver
            If ImageUrlOver <> "" Then OnClientMouseOut = "this.src='"
+ ImageUrl + "';" + OnClientMouseOut
            If OnClientMouseOver <> "" Then Me.Attributes.Add
("onmouseover", OnClientMouseOver)
            If OnClientMouseOut <> "" Then Me.Attributes.Add
("onmouseout", OnClientMouseOut)
            If OnClientClick <> "" Then Me.Attributes.Add("onclick",
OnClientClick)
            MyBase.OnPreRender(e)
        End Sub

        ''' <summary>
        '''  Define the method of IPostBackEventHandler that raises
change events.
        ''' </summary>
        ''' <param name="eventArgument"></param>
        ''' <remarks></remarks>
        Public Sub RaisePostBackEvent(ByVal eventArgument As String) _
           Implements IPostBackEventHandler.RaisePostBackEvent
            If HRef <> "" AndAlso eventArgument Is "Click" Then
                HttpContext.Current.Response.Redirect(HRef)
                Me.OnClick(EventArgs.Empty)
            End If
        End Sub
    End Class

While I cannot answer your question I would highly recommend AJAX as
is it is very easy to use and versatile. This link should be able to
help you accomplish what you want to do.

http://www.asp.net/AJAX/AjaxControlToolkit/Samples/Animation/Animation.aspx

Ty

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