var map = new GMap(document.getElementById("map"));
map.setMapType(G_HYBRID_MAP);
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());

function createMarker(point, nombre) {
var marker = new GMarker(point);
GEvent.addListener(marker, 'mouseover', function() { marker.openInfoWindowHtml(nombre);});
return marker;
}
//42.237250, -8.716384

var point= new GPoint (-8.716384, 42.237250);

var leyenda='<p style="color:#666; text-align:left; padding:4px;  "><span style="color:#f60; ">Centro de Estudios y Formaci&oacute;n Tesis S.L.</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br /><br />Oporto, 19. 36201 - VIGO. <br />Pontevedra<br /><br /><span style="color:#f60; ">T</span> 986 224 875 <br /><span style="color:#f60; ">F</span> 986 229 417&nbsp;</p>';

var marker = new GMarker(point);				
var marker = createMarker (point, leyenda); 
map.centerAndZoom(point, 0);

map.addOverlay(marker);