Smarty function as default value

Hello,

is there some way how to pass as default value to "default" modifier
own smarty function? I need something like this, but it clearly
doesn't work.

{$smarty.request.return|default:{insert name=url}}

Thank you for replies.

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Jiří Němec, ICQ: 114651500
www.menea.cz - www stránky a aplikace