it should work if you add target="plot" to the link:
<a href="#" onClick="wagmp_map_1_obj.getPointByAddress('<%=rs. address%>').
marker.openInfoWindowHtml(wagmp_map_1_obj.getPoint ByAddress('<%=rs.address%>').address.infowindowtex t);" target="plot"><%=rs.address%></a>