Prova cosi:
codice:
<a onMouseOver="document.getElementById('imgbig').src='square.aspx?img=public/admin/img/<%=rs.Fields("foto_01")%>&opx=280';">
							[img]square.aspx?img=public/admin/img/<%=rs.Fields([/img]&opx=90" name='foto1' ></a>
...
IMMAGINE PRIMARIA:
codice:
<a href="public/admin/img/<%=rs.Fields("foto_01")%>" >
[img]square.aspx?img=public/admin/img/<%=rs.Fields([/img]&opx=280" id="imgbig" ></a>
e togli function Buffer obsoleta, se non funziona