function $(tgtId) {
  return document.getElementById(tgtId);
}

function goPage( basePath , page ) {
  window.location = ""+basePath+""+page+"/";
}

function redirectUserSetTimer( strUrl ) {
  var timer = window.setTimeout("redirectUser('"+ strUrl +"')", 7000);
  return true;
}

function redirectUser( strUrl ) {
  window.location = ""+strUrl+"";
  return true;
}

function confirmDeleteAd( name, url ) {
  var confirmDelete = confirm("Weet u zeker dat u '"+name+"' wilt verwijderen?");
  if(confirmDelete == true) {
    window.location = url;
    return true;
  }
  return false;
}

function confirmAcceptBid( bidder, price, url ) {
  var confirmAccept = confirm("Weet u zeker dat u dit product wilt verkopen aan "+bidder+" voor € "+price+" ?");
  if(confirmAccept == true) {
    window.location = url;
  }
  return true;
}

function confirmAcceptInterested( bidder, charity, url ) {
  var confirmAccept = confirm("Weet u zeker dat u dit product wilt schenken aan "+bidder+" ( "+charity+" ) ?");
  if(confirmAccept == true) {
    window.location = url;
  }
  return true;
}

function confirmDeleteBid( bidder, price, url ) {
  var confirmAccept = confirm("Weet u zeker dat u "+bidder+"'s bod van € "+price+" wilt verwijderen ?");
  if(confirmAccept == true) {
    window.location = url;
  }
  return true;
}

function toggleAdType( tgtVal ) {
  var charityWindow = document.getElementById("charityWindow");
  var amountWindow  = document.getElementById("amountTr");

  if(tgtVal == "free") {
    charityWindow.style.display = "none";
    amountWindow.style.display  = "none";
    //amountWindow.style.visibility = "hidden";
  }else {
    charityWindow.style.display = "block";
    amountWindow.style.display  = "table-row";
  }

}

function toggleAangeboden( tgt ) {
  var sellFree = document.getElementById("sellFree");

  // If this changes we need to refill the select box so lets clear it
  removeOptions(sellFree);

  // If its aangeboden its can be sold
  if(tgt.value == "aangeboden") {
    toggleAdType("pay");
    var payOpt = document.createElement("option");
    payOpt.value = "pay";
    payOpt.text = "Te koop";
    sellFree.options.add(payOpt);
  }else {
    toggleAdType("free");
  }

  // The free option
  var freeOpt = document.createElement("option");
  freeOpt.value = "free";
  freeOpt.text = "Gratis";
  sellFree.options.add(freeOpt);

  return true;
}

function toggleCheckbox(tgtId) {
  var tgt = $(tgtId);
  if(tgt.checked == true) {
    tgt.checked = false;
  }else {
   tgt.checked = true;
  }
}

function removeOptions( selectEl ) {
  while(selectEl.length > 0) {
    selectEl.remove(selectEl.length-1);
  }
  return true;
}

function openPopup( url, width, height ) {
  window.open(url, 'Popup', 'width='+width+',height='+height+',screenX=' + ((screen.width - width) / 2) + ', screenY=' + ((screen.height - height) / 2) + ',scrollbars=yes,toolbar=no,location=no');
};

function changeCategory( tgt, fw ) {
  var val = tgt.value;
  if(val == null) { return false; }
  var tgtSelect = document.getElementById("subCategory");

  if(val != 0) {
    var req = null;

    if(window.XMLHttpRequest) {
      req = new XMLHttpRequest();
    }else if (window.ActiveXObject) {
      req  = new ActiveXObject("Microsoft.XMLHTTP");
    }

    req.onreadystatechange = function() {
      if(req.readyState == 4) {
        if(req.status == 200) {
          var jsonResponse = req.responseText;
          if(jsonResponse.length > 0) {
            var jsonObj = eval("("+jsonResponse+")");

            // Remove all options
            while(tgtSelect.options.length > 0) {
              tgtSelect.options[0] = null;
            }

            if(fw == "filter") {
              appendOptionEnd( '0' , 'Alle' );
            }

            for( var i = 0; i < jsonObj.categories.length; i++ ) {
              appendOptionEnd( jsonObj.categories[i].ID , jsonObj.categories[i].name );
            }

          }
        }
      }
    };

    req.open("GET", "/includes/marktplaats_advertisements.php?c="+val, true);
    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    req.send(null);
  }else {
    // Remove all options
    while(tgtSelect.options.length > 0) {
      tgtSelect.options[0] = null;
    }
    appendOptionEnd( '0', 'Kies Categorie' );
  }
}

function appendOptionEnd( id , name ) {
  var elOptNew = document.createElement('option');
  elOptNew.text = name;
  elOptNew.value = id;
  var elSel = document.getElementById('subCategory');

  try {
    elSel.add(elOptNew, null); // standards compliant; doesn't work in IE
  }
  catch(ex) {
    elSel.add(elOptNew); // IE only
  }
}