var hr,number,temp;
function change_number(pos,num){
  if(num != 0) {
    pos--;
  }
  hr = $$('._cart_' + num);
  link = hr[pos].href;
  n = $$('._number_' + num)[pos].selectedIndex;
  number = n +1;
  temp = link.split('&number');
  hr = temp[0] + '&number=' + number;
  for(j=0; j<3; j++){
    if($$('._number_' + num)[j]){
      $$('._number_' + num)[j].selectedIndex = n;
      $$('._cart_' + num)[j].href = hr;
    }
  }
}

function openpage() {
  for(i=0; i<6; i++){
    var hr = "";
    hr = $$('._cart_' + i);
    link = hr[0].href;
    n = $$('._number_' + i)[0].selectedIndex;
    number = n +1;
    temp = link.split('&number');
    hr = temp[0] + '&number=' + number;
    for(j=0; j<3; j++){
      if($$('._number_' + i)[j]){
        $$('._number_' + i)[j].selectedIndex = n;
        $$('._cart_' + i)[j].href = hr;
      }
    }
  }
}