function ceny()
{
	var str = document.getElementById('cn');
	
  if (document.order && document.order.size) {
   count = document.order.count.value;
     val = document.order.size[document.order.size.selectedIndex].value;
     ind = val.indexOf('-');
     if (ind>0){
		var sum = val.substring(ind+1,val.length) * count;
	   str.innerHTML = sum.toFixed(2);
     }
   }

 }