chImg = function(image) {
   image.src = (image.src.indexOf('_on')>0) ? image.src.replace(/_on/,"_off") : image.src.replace(/_off/,"_on");
 }

 post = function(action,event) {
   document.forms[0].action = action;
   document.forms[0].event.value = event;
   document.forms[0].submit();
 }

  ask = function(question) {
    return confirm(question);
  }

  cart_forcerecalc = function() {
    cont = document.getElementById('container');

    image = cont.getElementsByTagName('IMG');
    image[0].src = image[0].src.replace(/btn_tovabb.jpg/,'btn_ujraszamol.jpg');
    image[0].src = image[0].src.replace(/btn_megrendelem.jpg/,'btn_ujraszamol.jpg');
    nlink = cont.getElementsByTagName('A');
    nlink[0].href = "#";
    nlink[0].onclick = function() {
      post('','cart_recalc');
    }
  }