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Guys - don't confuse matters, please
{X_SITEURL} is a tag which is string-replaced with the XOOPS_URL and possibly more - depending on the situation - most prominently, it is used in the custom blocks and mail templates.
X_SITEURL is NOT a smarty variable and cannot be used for such. X_SITEURL can only be used in modules and areas of the core, where this is programmed - which in the core is the mailer and blocks. So for a module to understand {X_SITEURL}, the module itself will have to have code to deal with it.
Ronaldus, are you sure you need to put the site URL in the link? Isn't MultiMenu
meant to deal with site urls and work without the complete url?