function update_exchange()
{
 var give = document.getElementById("give").value;
 var take = document.getElementById("take").value;
 document.getElementById("img_give").src = img_src[give];
 document.getElementById("img_take").src = img_src[take];
 document.getElementById("reserve").innerHTML = reserve[take];
 document.getElementById("take_valiuta").innerHTML = valiuta[take];
 if( KoefCurses[give+take]>=1 )
 {
  document.getElementById("curse").innerHTML = InCurses[give+take]+" "+valiuta[give]+" = "+OutCurses[give+take]+" "+valiuta[take];
 }
 else if( KoefCurses[give+take]>0 )
 {
  document.getElementById("curse").innerHTML = InCurses[give+take]+" "+valiuta[give]+" = "+OutCurses[give+take]+" "+valiuta[take];
 }
 else
 {
  document.getElementById("curse").innerHTML = "Неверный тип обмена.";
 }
}

function ExcSubmit()
{
 var give = document.getElementById("give").value;
 var take = document.getElementById("take").value;
 if( KoefCurses[give+take]>0 )
 {
  return true;
 }
 else
 {
  alert("Обмен в таком направлении отсутствует!");
  return false;
 }
}
document.getElementById("take").selectedIndex = 1;
update_exchange();