var log = function(element) {
      
      if(typeof console == "object" && typeof console.log == "function") {
        console.log(element);
      } else {
        //do nothing
      }
      
    }
    
    function sleep(ms)
    {
      var dt = new Date();
      dt.setTime(dt.getTime() + ms);
      while (new Date().getTime() < dt.getTime());
    }


    if (document.getElementsByClassName == undefined) {
      document.getElementsByClassName = function(className)
      {
        var hasClassName = new RegExp("(?:^|\\s)" + className + "(?:$|\\s)");
        var allElements = document.getElementsByTagName("*");
        var results = [];
  
        var element;
        for (var i = 0; (element = allElements[i]) != null; i++) {
          var elementClass = element.className;
          if (elementClass && elementClass.indexOf(className) != -1 && hasClassName.test(elementClass))
            results.push(element);
        }
  
        return results;
      }
    }
  
    function changeHash(hash_string) {
      location.hash = hash_string;
    }

    function changeCurrencySelect(currency_code) {
      var currency_select = document.getElementById('currency_select');
      
      if(currency_select) {
        var option_collection = currency_select.options; 
        for(var i = 0; option_collection.length > i; i++) {
          if(option_collection[i].value == currency_code) {
            //option_collection[i].selected = true;
            currency_select.selectedIndex = i;
          } else {
            //option_collection[i].selected = false;
          }
        }
      }
    }

    function getHash() {
      return location.hash.replace('#',''); 
    }
    
    function selectPriceCurrency(currency) {
      switch(currency) {
        case "GBP":
          //changeHash(currency);
          rememberCurrency(currency);
          showPaymentOptions(currency);
          showPricesGBP();
        break;
        case "USD":
          //changeHash(currency);
          rememberCurrency(currency);
          showPaymentOptions(currency);
          showPricesUSD();
        break;
        case "AUD":
          //changeHash(currency);
          rememberCurrency(currency);
          showPaymentOptions(currency);
          showPricesAUD();
        break;
        case "EUR":
          //changeHash(currency);
          rememberCurrency(currency);
          showPaymentOptions(currency);
          showPricesEUR();
        break;
        case "PLN":
          //changeHash(currency);
          rememberCurrency(currency);
          showPaymentOptions(currency);
          showPricesPLN();
        break;
        default:
          //changeHash(currency);
          rememberCurrency("GBP");
          showPaymentOptions("GBP");
          showPricesGBP();
      }
    }

    function isAvailableCurrency($currency) {
      var currencies = ["GBP", "USD", "AUD", "EUR", "PLN"];
      var length = currencies.length;
      for(var i = 0; i < length; i++) {
          if(currencies[i] == $currency) return true;
      }
      return false;

    }
    
    function showPaymentOptions(paymentCurrency) {
      
      var paymentByPayPal = document.getElementsByClassName('payment_by_paypal')[0];
      var paymentByGateway = document.getElementsByClassName('payment_by_gateway')[0];
      
      var showPayPal = false;
      var showGateway = false;
      
      switch(paymentCurrency) {
        case "GBP":
          showPayPal = true;
          showGateway = true;
        break;
        
        case "USD":
          showPayPal = true;
      showGateway = true;
        break;
        
        case "AUD":
          showPayPal = true;
        break;
        
        
        case "EUR":
          showPayPal = true;
      showGateway = true;
        break;
        
        case "PLN":
          showPayPal = true;
        break;
        
        default:
          showPayPal = true;
          showGateway = true;
          
      }
      
      if(paymentByPayPal) {
        
        if(showPayPal) {
          paymentByPayPal.style.display = 'block';
        } else {
          paymentByPayPal.style.display = 'none';
        }
        
      }
      
      if(paymentByGateway) {
        
        if(showGateway) {
          paymentByGateway.style.display = 'block';
        } else {
          paymentByGateway.style.display = 'none';
        }
        
      }
      
    }

    function rememberCurrency(currency_code) {
      var url = "/ajax/selected_currency.php?currency_code=" + currency_code;
      
      peticion.open("GET", url);
      /*peticion.onreadystatechange = function() {
        if (peticion.readyState == 4) {
          place.innerHTML = peticion.responseText;
        }
      }*/
      //preventing old functions to execute
      peticion.onreadystatechange = function(){};
      peticion.send(null);
      
    }
    
    function changeCountry(country_id) {
      window.location = window.location + '?country_id=' + country_id;
    }
    
    function showPricesGBP() {
      showPrices('gbp');
    }

    function showPricesEUR() {
      showPrices('eur');
    }

    function showPricesUSD() {
      showPrices('usd');
    }
    
    function showPricesAUD() {
      showPrices('aud');
    }

    function showPricesPLN() {
      showPrices('pln');
    }

    function showPrices(class_name, ex_vat_only) {
      if(!ex_vat_only) {
      showPricesIncVat(class_name);
      }
      showPricesExVat(class_name);
      
    }

    function showPricesIncVat(element_class) {
        var allPriceContainers = document.getElementsByClassName('item_price_inc_vat');
        
        for(var i = 0; allPriceContainers.length > i; i++ ) {
          var priceElements = allPriceContainers[i].getElementsByTagName('span');
          for(var j = 0; j < priceElements.length; j++) {
            classNameRegExp = new RegExp('^' + element_class + "( *|$)"); 
            if(classNameRegExp.test(priceElements[j].className) ) {
              
              priceElements[j].style.display = 'inline';
            } else {
              
              priceElements[j].style.display = 'none';
            }
            
            
          }  
          
          
        } 
      
    }
    
    function showPricesExVat(element_class) {
      var allPriceContainers = document.getElementsByClassName('item_price_ex_vat');
      
      for(var i = 0; allPriceContainers.length > i; i++ ) {
        var priceElements = allPriceContainers[i].getElementsByTagName('span');
        for(var j = 0; j < priceElements.length; j++) {
          classNameRegExp = new RegExp('^' + element_class + "( *|$)"); 
          if(classNameRegExp.test(priceElements[j].className) ) {
        
            priceElements[j].style.display = 'inline';
          } else {
        
            priceElements[j].style.display = 'none';
          }
        }
        
        
        
      } 
      
    }