How do I reference the theme folder in blogengine.net?

I have a theme in blog engine.net I want to reference a .aspx file in an IFRAME in my theme master page (inside site.master). Something 开发者_运维百科like this:

<iframe src='/blog/themes/MCO/ContactForm.aspx' frameborder='0' width='250' height='75'></iframe>

Unfortunately this absolute path doesn't work. Is there some sort of helper function to get this reference? Like:

src='<%=BlogSettings.Instance.ThemeFolder+"ContactForm.aspx" %>'

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Try this one:

<img src="themes/<%=BlogSettings.Instance.Theme%>/images/logo.png" />

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*iframe src='/blog/themes/MCO/ContactForm.aspx'*

Why not try the full path url?

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The above marked good answer actually works only on the blog home page. This one should improve:

<img src="<%=Utils.ApplicationRelativeWebRoot %>themes/<%=BlogSettings.Instance.Theme%>/images/logo.png" />