Allow building cross-theme urls by using "m_theme" parameter

I'm having 2 themes:

• theme_one (url to "index.tpl" template: http://www.website.tld/theme_one/index.html); ID = 1
• theme_two (url to "index.tpl" template: http://www.website.tld/theme_two/home.html); ID = 2

While inside "theme_one" theme I'm building an url to "index.tpl" template in "theme_two" theme using this tag:

<inp2:m_Link template="index" m_theme="2"/>

As a result I would get http://www.website.tld/theme_two/index.html link (wrong url ending).