This is in reply to Paul A. Rubin's request (sorry for breaking the thread, email problem). The LaTeX code that produced the good output is below. I also forgot to mention that I'm using LyX 1.4.3. Now, the workaround would be to export to LaTeX and then hack the resulting file manually, but maybe things could be done more elegantly in LyX.
\be \begin{array}{c} \includegraphics[width=3cm]{q-skein1sf.eps}\end{array}=A(\lambda)\begin{array}{c} \includegraphics[width=3cm]{q-skein2sf.eps}\end{array}+B(\lambda)\begin{array}{c} \includegraphics[width=3cm]{q-skein3sf.eps}\end{array}. \ee A.M.