Abstract: This invention relates in general to sheets or films which are instantly mountable and dismountable to the surface of the glass for the use of the window advertisement, window art exhibition or heat and/or sun ray inhibitive media, or more particularly to a sheet of linen cloth including knitted fabric, or a sheet of printed or painted paper or film and if necessary, for sheets made of weak material, they could be adhesively taped or pasted to the surface of a transparent resilient sheet, whereby the linen cloth or printed or painted paper or film or resilient sheet are in turn mounted onto, or dismounted from, the surface of the window by means of cap-tapped or tube-tapped suction cups, weight bags and elasto sheet retaining rings.