/*
	getElementsByClassName
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/	
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};       




// measurement script for positioning stuff a bit more relative to to size of screen

function giveWindowSize() {
	
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }


// hoogteHeader
	var hoogteHeader=((myHeight/2)-311); 
		if (hoogteHeader > 10) { 
		
		
			if (hoogteHeader < 130) {
				document.getElementById('header').style.top= hoogteHeader+'px';}
				else {document.getElementById('header').style.top= '130px';}
			}
		else {document.getElementById('header').style.top= '10px';}

   


// hoogteContent
	var hoogteContent=((myHeight/2)-200); 
		if (hoogteContent > 80) { 
		
		
			if (hoogteContent < 400) {
				document.getElementById('content').style.marginTop= hoogteContent+'px';}
				else {document.getElementById('content').style.marginTop= '400px';}
			}
		else {document.getElementById('content').style.marginTop= '80px';}




// verbergen pay-off
	var breedteContent=((myWidth/2)-230); 
		if (breedteContent > 250) { 
		
				document.getElementById('pay-off').style.opacity= 1;
				document.getElementById('pay-off').style.filter = "alpha(opacity=100)"
	
				
				}
			
		else {
				document.getElementById('pay-off').style.opacity=(breedteContent/30) - 1.5;
				document.getElementById('pay-off').style.filter = "alpha(opacity=" + ((breedteContent/30) - 1.5)*100 + ")"
	
				}   





}




		// functie om breedte op te meten van alle echte tags binnen de te scrollen div.		
		function  geefBreedte(stretchDiv) {
		
			  var i = 0;
			  var totalWidth = 0;
			  var div = document.getElementById(stretchDiv);
		
			  for (i = 0; i < div.childNodes.length; i++) {
		
		
				  //alertMe (div.childNodes[i].tagName+' '+div.childNodes[i].nodeType+' '+parseInt(div.childNodes[i].offsetWidth)+qq)
		
				  //inhoud van div opschonen: alle nodes verwijderen die volgens nodtype geen normale tag (nodeType:1) zijn 
				  if ((div.childNodes[i].nodeType != 1) && (div.childNodes[i].tagName != 'SCRIPT')) {
					  div.removeChild(div.childNodes[i]);
				  }
		
				  // alleen de breedte opmeten van tags met nodeType=1
				  if ((div.childNodes[i].nodeType == 1) && (div.childNodes[i].tagName != 'SCRIPT')) {
					  totalWidth = totalWidth + parseInt(div.childNodes[i].offsetWidth);
				  }
			  }
		
			  return totalWidth;
		}
		
		
		var breedteTotaal = 0;
		
		function calcInnerWidth(stretchDiv) {
		
		
			  breedteFinal = geefBreedte(stretchDiv);
		
			  // uiteindelijke totaalbreedte doorgeven aan scroll-div +10 pixels extra safety voor FireFox 
			  // (alle browsers krijgen die +10 vervolgens wordt dat er weer afgetrokken - behalve voor Firefox)
			  breedteFinal = breedteFinal + 10;
		
			  if (navigator.userAgent.indexOf("Firefox") == -1) {
				  breedteFinal = breedteFinal - 10;
			  }
		
			  //alertMe('geefBreedte=' + breedteFinal);
		
			  document.getElementById(stretchDiv).style.width = breedteFinal + 'px';
		
		}












// init position measurement scripts: giveWindowSize()   

window.onresize = function X1(){
giveWindowSize()
}

window.onload = function X2(){
giveWindowSize()
}