// tonen van de div
function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {el.style.display = 'none';}
}
// maakt de background juiste grote
function blanket_size(popUpDivVar, iHeight) {
	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
    }
    var iSpaceHeight = iHeight / 2;  // is half popup's height
	var blanket = document.getElementById('blanket');
	blanket.style.height = blanket_height + 'px';
	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv_height=blanket_height/2-iSpaceHeight;
	popUpDiv.style.top = popUpDiv_height + 'px';
}
// maakt popup de juiste grote
function window_pos(popUpDivVar, contenID, iWidth, iHeight) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
    }
    var iSpaceWidth = iWidth / 2;  // is half popup's width
	var popUpDiv = document.getElementById(popUpDivVar);	
	window_width=window_width/2-iSpaceWidth;
	popUpDiv.style.left = window_width + 'px';
	popUpDiv.style.width = iWidth + "px";
	popUpDiv.style.height = iHeight + "px";

	var ContentDiv = document.getElementById(contenID);
	var realContHeight = iHeight - 40;//boven en onder zit rand van 20px
	ContentDiv.style.height = realContHeight + "px";
}

// opent een popup
function popup(windowname, contenID, URL, iWidth, iHeight) {
	var iFrame = document.getElementById('Pop_iFrame');
	iFrame.src = URL;
	blanket_size(windowname, iHeight);
	window_pos(windowname, contenID, iWidth, iHeight);
	toggle('blanket');
	toggle(windowname);
}

function popupClose(windowname) {
    toggle('blanket');
    toggle(windowname);
}