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;
	}	
	
	//if (document.getElementById('inhoud').clientHeight > windowHeight) {
		//windowHeight = document.getElementById('inhoud').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 showbox(sMessage, spfxDiv) {
	new Effect.Fade('overlay', { duration:0.1, from:0.6, to:0.6 } );
	if( spfxDiv == null ) 	spfxDiv  = 'alert';
	scroll(0,0);
	
	//document.body.scroll='no';
	objOverlay = document.getElementById('overlay');
	objMessage = document.getElementById(spfxDiv+'box');
	objMessageText = document.getElementById(spfxDiv+'text');

	objMessageText.innerHTML = sMessage;

	// set height of Overlay to take up whole page and show
	arrayPageSize = getPageSize();
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
	objMessage.style.display = 'block';
	
	// Hide select boxes as they will 'peek' through the image in IE
	selects = document.getElementsByTagName("select");
	for (i = 0; i != selects.length; i++) {
			selects[i].style.visibility = "hidden";
	}

	if (objMessage) {
		objMessage.style.top = "100px";
//		objMessage.style.top =  (( arrayPageSize[3] / 2) - objMessage.offsetHeight + 'px');
		objMessage.style.left = (((arrayPageSize[0] - 20 - objMessage.offsetWidth) / 2) + 'px');
		
	}
	
	
	//Always show top
	return true;
	
	
}

function closebox(){
	new Effect.Fade('overlay', { duration:0.3, queue:'end'} );
	objOverlay = document.getElementById('overlay');
	
	// make select boxes visible
	selects = document.getElementsByTagName("select");
    for (var i = 0; i != selects.length; i++) {
    	selects[i].style.visibility = "visible";
	}
	document.body.scroll='';
//	objOverlay.style.display = 'none';
	objMessage.style.display = 'none';
	
}

function htmlEncode(s) {
    var str = new String(s);
    str = str.replace(/&/g, "&amp;");
    str = str.replace(/</g, "&lt;");
    str = str.replace(/>/g, "&gt;");
    str = str.replace(/"/g, "&quot;");
    return str;
}