onchange event is not firing on IE

hi all
i have a custom textbox with some custom events.
Protected Overrides Sub OnPreRender(e As EventArgs) MyBase.OnPreRender(e) If TextPostBack = True Then Me.Attributes.Add("onchange", "DoPostBack('" & Me.ClientID & "')") End If Me.Attributes.Add("onkeypress", "javascript:return allownumbers(event," & Me.DecimalPlaces & "," & Me.ClientID & ".value,'" & Me.ClientID & "');") Me.Attributes.Add("onblur", "javascript:return CheckValue(" & Me.DecimalPlaces & "," & Me.ClientID & ".value,'" & Me.ClientID & "');") Me.Attributes.Add("onkeyup", "javascript:return MaximumCharacterAllow('" & Me.ClientID & "'," & Me.Maximum.ToString.Length - Me.DecimalPlaces &am ...