function nextSet(offset) //om met het zelfde zoekcriterium naar de volgende 10 boeken te gaan
{
  var form = document.form;
  if(form)
  {
    form.offset.value = offset;
    form.submit();
  }
}

function auteurlink(tekst) //om op de link auteur of op de letter te klikken en te filteren
{
  var form = document.form;
  if(form)
  {
    form.auteur.value = tekst;
    form.titel.value = '';
    form.trefwoord.value = '';
    form.eerstedruk.checked = false;
    form.gesigneerd.checked = false;
    form.categorie.value = 0;
    form.offset.value = 0;
    form.submit();
  }
}

function orderBook(id) //om naar bestel.php te gaan
{
  var form = document.form;
  if(form)
  {
    form.page.value = 'ConfirmAddBookPage';
    form.OrderBookId.value = id;
    form.submit();
  }
}

function addBookToList(id) //om boeknr aan de sessievariabele bestelboeken toe te voegen
{
  var form = document.form;
  if(form)
  {
    form.page.value = 'catalogus';
    form.AddBookToListId.value = id;
    form.submit();
  }
}

function deleteBookFromList(id) //om boeknr aan de sessievariabele bestelboeken toe te voegen
{
  var form = document.form;
  if(form)
  {
    form.DeleteBookFromListId.value = id;
    form.submit();
  }
}
function clearOffset()
{
  var form = document.form;
  if(form)
  {
    form.offset.value = 0;
    return true;
  }
  return false;
}
function continueOverview() //om verder te gaan met zoeken zonder het boek op te nemen in de winkelwagen
{
  var form = document.form;
  if(form)
  {
    form.page.value = 'catalogus';
    form.submit();
  }
}
function showOrderList() //om naar het afrekenen scherm te gaan
{
  location="?page=OrderList"
}
function submitOrder() //om naar het afrekenen scherm te gaan
{
  var form = document.form;
  if(form)
  {
    form.page.value = 'SubmitOrder';
    form.submit();
  }
}
function HideImage()
{
  var divImage = document.getElementById('divImage');
  var image = document.getElementById('image');
  image.src = '';
  image.style.visibility = 'hidden';
  divImage.style.visibility = 'hidden';
 
}
function ShowFotoInLayer(imageName, width, height)
{
  var divImage = document.getElementById('divImage');
  var image = document.getElementById('image');
  image.src = imageName;
  divImage.style.visibility = 'visible';
  image.style.visibility = 'visible';
  divImage.style.width = width;
  divImage.style.heigth = 0;
  showDivAdCenter(width,height,'divImage')
}

function foto(url, id, width, height)
{
  var	leftPosition = (screen.width - width)/2;
  var	topPosition  = (screen.height - height)/2;
  var strUrl  = url + "?id=" + id;
  var strMode = "location=no,resizable=no,scrollbars=no,toolbar=no,status=no,menubar=no,directories=no, left="+ leftPosition +",top=" + topPosition + ",height=" + height + ",width=" + width + strMode;
  var subWindow = window.open(strUrl,"def",strMode);
}

function printKlant(klantID) 
//om klant met boeken te printen 
//Anders dan bij Administratie: klant hoeft geen verzendkosten te printen
{
  var hoogte,breedte;
  var	schermbr=screen.width;
  var schermho=screen.height;
  hoogte=600;
  breedte=800;
  leftpos=50;
  toppos=50;
  var strurl ="factuur.php?klantID="+klantID;
  var windowname = "print";
  strMode=',scrollbars=yes,menu=no,toolbar=yes,resize=yes,titlebar=no,resizable=yes';
  strMode="location=no,resizable=yes, left="+ leftpos +",top=" + toppos + ",height=" + hoogte + ",width=" + breedte + strMode;
  window.open(strurl, windowname, strMode);
}

function showMaps(url) 
{
  var hoogte  = 600;
  var breedte = 800;
  var leftpos = (screen.width - breedte) / 2;
  var toppos  = (screen.height - hoogte) / 2;
  var windowname = "Hinderickx_Winderickx_Maps";
  strMode = ',scrollbars=yes,menu=no,toolbar=yes,resize=yes,titlebar=no,resizable=yes';
  strMode = "location=no,resizable=yes, left="+ leftpos +",top=" + toppos + ",height=" + hoogte + ",width=" + breedte + strMode;
  var newWindow =  window.open(url, windowname, strMode);
  newWindow.focus();
}