Abstract: The present invention provides a panel mounting arrangement for mounting a panel in a generally horizontal position from a panel support. The panel support includes mounting surfaces at generally right angles to one another with each mounting surface being provided with an upwardly opening pocket. The panel itself is provided with a downturned corner flange including first and second tongue portions formed directly in the flange so as to fit downwardly into the first and second pockets of the panel support during assembly of the arrangement. As the tongue portions fit down into the pockets there is both a side to side as well as a front to back wedging on the tongue portions to provide an extremely tight fitting of the tongue portions in their respective pockets.