function open_cost1() {
  cost1.style.visibility="visible";
}
function close_cost() {
  cost1.style.visibility="hidden";
}

function open_product1() {
  product1.style.visibility="visible";
  product2.style.visibility="hidden";
}
function open_product2() {
  product1.style.visibility="hidden";
  product2.style.visibility="visible";
}
function close_product1() {
  product1.style.visibility="hidden";
  product2.style.visibility="hidden";
}

function open_product11() {
  product11.style.visibility="visible";
  product12.style.visibility="hidden";
}
function open_product12() {
  product11.style.visibility="hidden";
  product12.style.visibility="visible";
}
function close_product2() {
  product11.style.visibility="hidden";
  product12.style.visibility="hidden";
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}