if(document.images != null) {
    var i1= new Image();
    i1.src="images/sterng.gif";	
    var i2= new Image();
    i2.src="images/sternga.gif";
}

function cs(selected,nr){
	if(selected==0){
 	document.images["men"+nr].src=i2.src;
 } 
}
function cb(selected,nr){
	if(selected==0){
 	document.images["men"+nr].src=i1.src;
 } 
}