You can open the map in a lightbox. Just add the parameter lightbox to the mosmap or set it as a general option. You also can set the size of the lightbox with lbxwidth and lbxheight. A caption is possible with lbxcaption and the zoomlevel can be set different then of the showed map by parameter lbxzoom. You can set a different center with lbxcenterlat and lbxcenterlon.
You can change the text of the link in the configuration of the plugin. You can even make it a button or image by placing <img src='<url>' /> in the field text of the lightbox link in the configuration of the plugin.