[l2h] problems with math equation figures

[Aline Gesualdi]

Hello everybody,   I�m having problems to convert equations to images. The equation image has a gray background and has a black risk in the inferior part and lateral left of the figure.   The command $\alpha = \beta + \lambda$ produces the defect in the figure, but when I put \begin{figure} $\alpha = \beta + \lambda$ \end{figure} the image is OK.   What command makes the $$ equation image in the middle of the text with white background and no risks?   Aline