The tags only for detailed view page.
{returnto} — Returns a link to previous page (only for Detailed Page Layout)
{gobackbutton:|custom image icon|,|custom option|,|label|} ExtraSearch will replace it with a proper button and with a link to a catalog page where the visitor came from. But only If there is a «returnto=» option in the URL. (only for Detailed Page Layout)
Example: {gobackbutton:templates/images/go_back_button_32.png,,Go Back}
label is optional if you don't set it then ExtraSearch default words will be used (BACK2PREVIUOS), set to "-" to hide it.