这个参数中好像还没有和收藏夹有关的
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_media The sURL is loaded into the HTML content area of the Media Bar. Available in Internet Explorer 6 or later.
_parent The sURL is loaded into the current frame's parent. If the frame has no parent, this value acts as the value _self.
_search Available in Internet Explorer 5 and later. The sURL is opened in the browser's search pane.
_self The current document is replaced with the specified sURL .
_top sURL replaces any framesets that may be loaded. If there are no framesets defined, this value acts as the value _self.