function getPageSize(){

	var xScroll, yScroll;

	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}

	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	

	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
	
}
function tintScreen(){
	//alert( 'test' );
	arrayPageSize = getPageSize();
	//var div  = document.createElement( 'div' );
	//div.className = 'tintScreen';
	//div.id = 'tintScreen';
	var div = document.getElementById( 'tintScreen' );
	div.style.height = ( ( arrayPageSize[1] ) + 'px' );
	div.style.width = '100%';
	div.style.display = '';
	//document.body.appendChild( div );
}
function showWindow( szX , szY ){
	var div  = document.getElementById( 'window' );
	
	div.style.display = '';
	div.style.left = '50%';
	div.style.width = szX + 'px';
	div.style.marginLeft = '-' + ( szX / 2 ) + 'px';
	div.style.top = '50%';
	div.style.height = szY + 'px';
	div.style.marginTop = '-' + ( szY / 2 ) + 'px';

	
	// Add close button
	/*var btn  = document.createElement( 'div' );
	btn.className = 'closeBtn';
	btn.innerHTML = 'Sluiten';
	
	if( btn.attachEvent ) btn.attachEvent('onclick', 'hideLayers()');
	else btn.setAttribute('onclick', 'hideLayers()'); 
	
	div.appendChild( btn );*/
}
/*function hideLayers(){
	document.getElementById( 'window' ).style.display = 'none';
	removeElement( 'tintScreen' );
}
function removeElement( id ){
	parent = document.getElementById( id ).parentNode;
	child = document.getElementById( id ); 
	parent.removeChild( child ); 
}*/