is made of a substantially rigid material such as metal polymer plastic or composite fig5 illustrates a center clip 310 that attaches to the crossmember 306 of a upper screen 300 positioned below a like lower screen 300 the clip 310 is attached to a center cable 312 the center cable 312 is also attached to the upper screen 300 positioned above the like lower screen 300 the length of the center cable 312 is adjustable allowing the lower edge 304 of the upper screen 300 to move away from the crossmember 306 of the lower screen 300 an amount constrained by the length for which the center cable 312 is adjusted fig6 illustrates a magnet 314 that is located with the screen 300 preferably at least one magnet 314 is located proximate the side edge 305 the magnet 314 is either attached to the outside of the screen 300 or installed inside the screen 300 the support tube 200 comprises a ferrous region that engages the screen 300 and magnet 314 in an alternative embodiment the magnet 314 is a ferrous material and the ferrous region of the support tube 200 is magnetic the purpose of the magnet 314 is to hold the screen 300 attached to the support tube 200 in another embodiment both the support tube 200 and screen 300 comprise attracting magnetic regions as illustrated in.