if (document.images) { 

img1N= new Image(30,34); 
img1N.src= 'images/apek.png' ; 
img1H= new Image(30,34); 
img1H.src= 'images/apekH.png' ; 

img2N= new Image(48,23); 
img2N.src= 'images/sos.png' ; 
img2H= new Image(48,23); 
img2H.src= 'images/sosH.png' ;
 
function myOn(myImgName) { 
document[myImgName].src=eval(myImgName+ 'H' ).src; 
} 

function myOut(myImgName) { 
document[myImgName].src=eval(myImgName+ 'N' ).src; 
} 

}