var gFrozenImage;

function CSFreezeImage(n)
{
  gFrozenImage = CSFindObj(n);
} // CSFreezeImage


function CSPreloadImages()
{
  var d=document;
  if(d.images)
  {
    if(!d.CSp)
      d.CSp=new Array();
    var i,j=d.CSp.length,a=CSPreloadImages.arguments;
    for(i=0; i<a.length; i++)
      if(a[i].indexOf("#")!=0)
      {
        d.CSp[j]=new Image;
        d.CSp[j++].src=a[i];
      }
  }
} // CSPreloadImages


function CSFindObj(n,d)
{
  var p,i,x;
  if(!d)
    d=document;
  if((p=n.indexOf("?"))>0&&parent.frames.length)
  {
    d=parent.frames[n.substring(p+1)].document;
    n=n.substring(0,p);
  }
  if(!(x=d[n])&&d.all)
    x=d.all[n];
  for(i=0;!x&&i<d.forms.length;i++)
    x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++)
    x=CSFindObj(n,d.layers[i].document);
  if(!x && d.getElementById)
    x=d.getElementById(n);
  return x;
} // CSFindObj


function CSSwapImage()
{
  var i,j=0,x,a=CSSwapImage.arguments;
  for(i=0;i<(a.length-2);i+=3)
  {
    if((x=CSFindObj(a[i]))!=null)
    {
      if(gFrozenImage!=x)
      {
        if(!x.oSrc)
          x.oSrc=x.src;
        x.src=a[i+2];
      }
    }
  }
}

var TimerId;
var Interval = 3000;
var Images = new Array();
var ImagePointers = new Array()

function CSaddImage(stack,imagename)
{
  CSPreloadImages(imagename);
  if(!Images[stack])
    Images[stack] = new Array();
  Images[stack].push(imagename);
  ImagePointers[stack] = 0;
} // addImage


function CSrotateImages(stack,target,delay)
{
  var myStack = Images[stack];
  if(myStack)
  {
    if(myStack.length>0)
    {
      (ImagePointers[stack])++;
      if(ImagePointers[stack]>=myStack.length)
        ImagePointers[stack] = 0;

      theDiv = document.getElementById(target);
      theDiv.style.backgroundImage = "url(" + myStack[ImagePointers[stack]] + ")";
      TimerId = setTimeout("CSrotateImages(\"" + stack + "\",\"" + target + "\",0)",
                  Interval+delay);
    }
  }
} // CSrotateImages


function cs_disableElement(whatElement)
{
  $(whatElement).setStyle({display: 'none'});
} // cs_disableElement


function cs_enableElement(whatElement)
{
  $(whatElement).setStyle({display: 'block'});
} // cs_enableElement


function cs_clearListElements(whatElement)
{
  var e = $(whatElement);
  while(e.options.length>0)
    e.remove(0);
} // cs_clearListElements


function cs_addListElement(whatElement,whatItem,whatValue)
{
  var e = $(whatElement);
  var len = e.options.length;
  e.options[len] = new Option(whatItem,whatValue,false,false);
} // cs_addListElement


function cs_setListingElements()
{
  var args = cs_setListingElements.arguments;
  var target = args[0];
  cs_clearListElements(target);
  for(i=1;i<args.length;i++)
    cs_addListElement(target,args[i],args[i]);
} // cs_setListingElements


function isblank(s)
{
  for(var i = 0; i < s.length; i++ )
  {
    var c = s.charAt(i);
    if((c!=' ') && (c!='\n') && (c!='\t'))
      return false;
  }
  return true;
} // isblank


function validateResponsForm(formName)
{
  var theMessage = '';
  var bValid = true;
  var errcnt = 0;

  if(isblank($("#respons")[0].value))
  {
    theMessage += 'Het veld \'Antwoord\' is verplicht.\n';
    bValid = false;
    errcnt++;
  }

  if(isblank($("#name")[0].value))
  {
    theMessage += 'Het veld \'Naam\' is verplicht.\n';
    bValid = false;
    errcnt++;
  }

  if(isblank($("#address")[0].value))
  {
    theMessage += 'Het veld \'Address\' is verplicht.\n';
    bValid = false;
    errcnt++;
  }

  if(isblank($("#zipcode")[0].value))
  {
    theMessage += 'Het veld \'Postcode\' is verplicht.\n';
    bValid = false;
    errcnt++;
  }

  if(isblank($("#city")[0].value))
  {
    theMessage += 'Het veld \'Woonplaats\' is verplicht.\n';
    bValid = false;
    errcnt++;
  }

  if(isblank($("#email")[0].value))
  {
    theMessage += 'Het veld \'Email\' is verplicht.\n';
    bValid = false;
    errcnt++;
  }

  if(!bValid)
  {
    if(errcnt==1)
    {
      alert('Het volgende probleem heeft zich voorgedaan:\n\n' + theMessage + '\nCorrigeer deze velden en druk opnieuw op inzenden');
    }
    else
    {
      alert('De volgende problemen hebben zich voorgedaan:\n\n' + theMessage + '\nCorrigeer deze velden en druk opnieuw op inzenden');
    }
  }
  return bValid;
}