function closePopup() {
		document.getElementById("popup").style.display = "none"; 		
	}
	
	function openPopup(uid) {
		/*const AJAX_URI = "https://www.swag.ibp-dresden.de/wp-content/plugins/cvapi/ajax_zirk.php" + "?uid=" + uid;*/
		document.getElementById("popup").style.display = "block"; 
		document.getElementById("popup_close").addEventListener("click", closePopup);
		resizePopup();
		/*const xhttp = new XMLHttpRequest();
		xhttp.onload = function() {
			document.getElementById("popup_content").innerHTML = this.responseText;
			var i = -1;
			do {
				i++;
			} while(treffdaten[i].uid != uid);
			document.getElementById("treffdata_hl").innerHTML = treffdaten[i].hl;
			document.getElementById("treffdata_txt").innerHTML = treffdaten[i].treff;
		}
		xhttp.open("GET", AJAX_URI, true);
		xhttp.send();*/
	}
	
	function resizePopup() {
		var screenX = window.innerWidth;
		var screenY = window.innerHeight;
		var scrollX = window.pageXOffset;
		var scrollY = window.pageYOffset;
		if(screenX < 780-50)
			document.getElementById("popup").style.width = (screenX-50) + "px";
		else
			document.getElementById("popup").style.width = "320" + "px";
		if(screenY < 400-40) {
			document.getElementById("popup").style.height = (screenY-40) + "px";
		} else {
			document.getElementById("popup").style.height = "400" + "px";
		}
		var popupY = parseInt(document.getElementById("popup").offsetHeight);
		var popupX = parseInt(document.getElementById("popup").offsetWidth);
		document.getElementById("popup").style.top = ((screenY-popupY)/2 + scrollY + -100) + "px";
		document.getElementById("popup").style.left = ((screenX-popupX)/2 + scrollX) + "px";
	}

	function positioningPopup() {
		//document.getElementById("popup").style.top = window.scrollY + "px";
		var screenY = window.innerHeight;
		var scrollY = window.pageYOffset;
		var popupY = parseInt(document.getElementById("popup").offsetHeight);		
		document.getElementById("popup").style.top = ((screenY-popupY)/2 + scrollY + -100) + "px";
	}

	window.addEventListener("resize", resizePopup);
	document.addEventListener("scroll", positioningPopup);	
	
	function copy2cb(idlist) {
		var i = -1;
		var el_txt = '';
		while(++i < idlist.length) {
			el_txt += document.getElementById(idlist[i]).innerHTML + '\n';
			//el.select();
			//el.setSelectionRange(0, 99999); // for mobile dev
			navigator.clipboard.writeText(el_txt);
		}
		alert("Die Adresse wurde in die Zwischenablage kopiert: \n" + el_txt);
	}