Using the vertical scrolling images module from gopiplus the default behaviour (target='_blank') will be okay, if you link the image to a foreign site.

Copy <your site>\modules\mod_vertical_scrolling_images\tmpl\default.php

to <your site>\templates\<your template>\html\mod_vertical_scrolling_images\default.php

Open the file default.php with an editor and replace '_blank' with '_self' (Line 38 and 40). After saving the file your target will be the current browser tab.

If you get errors concerning the image path edit the file <your site>/modules/mod_vertical_scrolling_images/helper.php

See Article Getting No Image Directory error in gopiplus plugin? Special thanks to Gopi Ramasamy for very quick support!