if(document.images){
       start1=new Image
       start2=new Image
       cel1=new Image
       cel2=new Image
       pro1=new Image
       pro2=new Image
       for1=new Image
       for2=new Image
       pra1=new Image
       pra2=new Image
       dzi1=new Image
       dzi2=new Image
       kon1=new Image
       kon2=new Image
       
       start1.src='i/menu_01.jpg'
       start2.src='i/menu_over_01.jpg'
       cel1.src='i/menu_02.jpg'
       cel2.src='i/menu_over_02.jpg'
       pro1.src='i/menu_03.jpg'
       pro2.src='i/menu_over_03.jpg'
       for1.src='i/menu_04.jpg'
       for2.src='i/menu_over_04.jpg'
       pra1.src='i/menu_05.jpg'
       pra2.src='i/menu_over_05.jpg'
       dzi1.src='i/menu_06.jpg'
       dzi2.src='i/menu_over_06.jpg'
       kon1.src='i/menu_07.jpg'
       kon2.src='i/menu_over_07.jpg'
       
       
       
}
function zmiana(polerys,nowyrys){
       if(document.images){
              document[polerys].src=eval(nowyrys+".src")
       }
}