if (( type_work.selectedIndex==3 || type_work.selectedIndex==4 ) && ( type_franch.selectedIndex==1 || type_franch.selectedIndex==2 ) && ( type_color.selectedIndex==1 || type_color.selectedIndex==2 ) && (type_art.selectedIndex==10 )) { price = (price - 100); document.getElementById("discount").style.display = "block"; } else { document.getElementById("discount").style.display = "none"; };
Заработало! Спасибо за терпение!