Below are the parameters that are supported by the GMap plugin (case sensitivity applies - valid values are shown below exactly as typed).

mapid - the number of the map you created using GMAPS

width - redefines the default map width

height - redefines the default map height

zoom - Zoom level.  Use 1-18

zoomtype - None, Large, Small

maptype - Normal, Satellite, Hybrid

showindex - Y = Yes, N = No

indexformat - 0 = horizontal, 1 = vertical

When entering the height and width, please remember to use measurement units.  If not, the map will not render properly.