a window frame 12 for mounting within an aperture of an unillustrated building structure wall a sliding window panel 14 is movably mounted within the window frame 12 for vertical reciprocation relative thereto so as to permit opening of the window as illustrated in fig1 of the drawings a magnetic securing means 16 is secured to opposed exterior surfaces of the sliding window panel 14 as well as to opposed interior surfaces of the window frame 12 for securing the sliding window panel 14 relative to the window frame 12 by this structure the window panel 14 can be opened and secured in a desired position relative to the window frame 12 as best illustrated in fig1 through 3 it can be shown that sliding window panel 14 according to the present invention 10 preferably comprises a perimeter frame 18 movably mounted within the window frame 12 by conventional guiding structures such as cooperatively engagable grooves and projections a glass pane 20 extends across the perimeter frame 18 so as to permit viewing of objects exterior of the building structure through the sliding window panel 14 by this structure the sliding window panel 14 can be selectively reciprocated within the confines of the window frame 12 to permit opening of the window as shown in fig1 and 2 of the drawings as shown in fig3 the sliding window panel 14 can be lowered into a lower most position so as to close the window with continuing reference to fig1 through 3 it can be shown that the magnetic securing means 16 according to the present invention 10 preferably comprises a pair of window frame plates 22 secured to opposed interior surfaces of the window frame 12 proximal to an upper end thereof preferably the window.