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but2On= new Image;but2On.src= "img/presentation_on.gif"   ;but2Off = new Image;but2Off.src= "img/presentation_of.gif";
but3On= new Image;but3On.src= "img/szok_on.gif"   ;but3Off = new Image;but3Off.src= "img/szok_of.gif";
but4On= new Image;but4On.src= "img/galery_on.gif"  ;but4Off = new Image;but4Off.src= "img/galery_of.gif";


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function ImgOff(imgName){imgOff = eval(imgName + "Off.src");document [imgName].src = imgOff;}