if(document.images){
       a1=new Image
       a2=new Image
       b1=new Image
       b2=new Image
       c1=new Image
       c2=new Image
       d1=new Image
       d2=new Image

       a1.src='images/m2.jpg'
       a2.src='images/m2s.jpg'
       b1.src='images/m3.jpg'
       b2.src='images/m3s.jpg'
       c1.src='images/m4.jpg'
       c2.src='images/m4s.jpg'
       d1.src='images/m5.jpg'
       d2.src='images/m5s.jpg'
}
function zmiana(polerys,nowyrys){
       if(document.images){
              document[polerys].src=eval(nowyrys+".src")
       }
}