//milliseconds
var slideShowSpeed = 5000

//seconds
var crossFadeDuration = 3

//image files
var PicTop = new Array() 
PicTop[0] = 'images/slideshow/1.jpg'
PicTop[1] = 'images/slideshow/2.jpg'
PicTop[2] = 'images/slideshow/3.jpg'
PicTop[3] = 'images/slideshow/4.jpg'
PicTop[4] = 'images/slideshow/5.jpg'
PicTop[5] = 'images/slideshow/6.jpg'
//PicTop[6] = 'images/slideshow/7.jpg'
//PicTop[7] = 'images/slideshow/8.jpg'
//PicTop[8] = 'images/slideshow/9.jpg'

var tm
var j = 0
var pTop = PicTop.length

var preLoad = new Array()
for (i = 0; i < pTop; i++){
   preLoad[i] = new Image()
   preLoad[i].src = PicTop[i]
}

function runSlideShow(){
   if (document.all){
      document.images.SlideShowTop.style.filter="blendTrans(duration=2)"
      document.images.SlideShowTop.style.filter="blendTrans(duration=crossFadeDuration)"
      document.images.SlideShowTop.filters.blendTrans.Apply()      
   }
   document.images.SlideShowTop.src = preLoad[j].src
   if (document.all){
      document.images.SlideShowTop.filters.blendTrans.Play()
   }
   j = j + 1
   if (j > (pTop-1)) j=0
   tm = setTimeout('runSlideShow()', slideShowSpeed)
}

function validate_form() {
  validity = true; 
  if (!check_empty(document.form.naam.value))
        { validity = false; alert('U heeft geen naam ingevuld!'); }
  else if (!check_email(document.form.email.value))
        { validity = false; alert('Het E-mail adres is ongeldig!'); }
return validity;
}

function check_empty(text) {
  return (text.length > 0); // returns false if empty
}

function check_email(adres) {
  if ((adres == "")
    || (adres.indexOf ('@') == -1)
    || (adres.indexOf ('.') == -1))
      return false;
  return true;
}
function check_telefoon(nr1,nr2,nr3) {
  if ((nr1 == "") && (nr2  == "") && (nr3  == ""))
		{return false;}
  else
		{return true;}
}

function correctPNG() // correctly handle PNG transparency in Win IE 5.5 or higher.
{
	for(var i=0; i<document.images.length; i++)
	{
		var img = document.images[i];
		var imgName = img.src.toUpperCase();
		if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
		{
			var imgID = (img.id) ? "id='" + img.id + "' " : "";
			var imgClass = (img.className) ? "class='" + img.className + "' " : "";
			var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' ";
			var imgStyle = "display:inline-block;" + img.style.cssText;
			if (img.align == "left") 
				imgStyle = "float:left;" + imgStyle;
			if (img.align == "right") 
				imgStyle = "float:right;" + imgStyle;
			if (img.parentElement.href) 
				imgStyle = "cursor:hand;" + imgStyle;
			var strNewHTML = "<span " + imgID + imgClass + imgTitle
			+ " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
			+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
			+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>";
			img.outerHTML = strNewHTML;
			i = i-1;
		}
	}
}