I am try to use the following razor script and it does not work with the following error.

@inherits umbraco.MacroEngines.DynamicNodeContext
@if(@Model.showTopBorders != false)
{
 if(@Model._websitePicker = 168)
 {
  <img src="/media/123/top_bar.jpg" atl="Top Grey Image" />
  <img src='@Model.Media("topImage", "umbracoFile")' />
  <img src="/media/53/bottom_bar.jpg" alt="Bottom Grey Bar" />
  }else
 {
  <img src="/media/123/top_bar.jpg" alt="Top Grey Image" />
  <img src='@Model.Media("topImage", "umbracoFile")' />
  <img src="/media/53/bottom_bar.jpg" alt="Bottom Grey Image" />
  }
 }else
{
 <img src='@Model.Media("topImage", "umbracoFile")' />
 }

The error is:

Error Loading Razor Script (file: Top Image2) 'umbraco.MacroEngines.DynamicNode' does not contain a definition for '_websitePicker' at CallSite.Target(Closure , CallSite , Object , Int32 )

at System.Dynamic.UpdateDelegates.UpdateAndExecute2[T0,T1,TRet](CallSite site, T0 arg0, T1 arg1)

  at ASP._Page_macroScripts_TopImage2_cshtml.Execute() in \\TopImage2.cshtml:line 4

at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()

at System.Web.WebPages.WebPage.ExecutePageHierarchy()

at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)

at umbraco.MacroEngines.RazorMacroEngine.ExecuteRazor(MacroModel macro, INode currentPage)

at umbraco.MacroEngines.RazorMacroEngine.Execute(MacroModel macro, INode currentPage)

Many thanks

TT