the different widths of the boards on each side of a window frame each set 58 comprises a pair of angle members 60 62 similar to top mounting bracket 16 as shown in fig3 and 5 a portion 69 of member 60 parallel to window frame 12 is provided with a longitudinal slot 64 so that members 60 and 62 can telescope together to allow for differences in window frame width the short leg of each angle member 60 62 is screwed to the side of the window frame with the axes of the screws parallel to the window pane the legs 64 66 of the angle members 60 62 are fastened together by a fastener 68 which screws through portion 69 into slot 64 and bears against leg 66 of angle member 62 this procedure guarantees that the long legs of the angle members will remain parallel to the window pane and the wall even if the window frame is tapered thinner as it approaches the window pane as shown by dashed lines 70 and 72 in fig2 and 3 for installation on double or triple windows the brackets 30 of adjoining frameworks 10 can be fastened together for stability forming a decorative lattice it will be appreciated that the depending hook on each of the top and bottom ear brackets and a.