How do i get an item from the dictionary?

I've tried this, passing a parameter in the macro:

@{

  var image = @Model.AncestorOrSelf().Media("siteLogo");

  var link = "@Model.Parameter.LogoLink";

}

<a href="@link" title="Home">

  <img alt='@image.Name' src='@image.UmbracoFile' />

</a>

This doesnt work, i've also tried this, but then i get an error:

var link = "@Model.Dictionary.DictionaryItemAlias("LogoLink");