JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script>

<a href="#" class="topopup">Opret</a>

    <div id="toPopup"> 
        
        <div class="close"></div>
        <span class="ecs_tooltip">Luk (ESC)<span class="arrow"></span></span>
        <div id="popup_content">
        <font style="font-color:#CC272D"><h2>Opret bruger</h2></font><br />
            blabla
            </div>
</div>

<div class="loader"></div>
    <div id="backgroundPopup"></div>

CSS

/* 
	author: istockphp.com
*/
#backgroundPopup { 
	z-index:9999999;
	position: fixed;
	display:none;
	height:100%;
	width:100%;
	background:#000000;	
	top:0px;  
	left:0px;
}
#toPopup,#toPopup2,#toPopup3,#toPopup4,#toPopup5,#toPopup6,#toPopup7,#toPopup8,#toPopup9,#toPopup10 {
	font-family: "lucida grande",tahoma,verdana,arial,sans-serif;
    background: none repeat scroll 0 0 #FFFFFF;
    border: 10px solid #ccc;
    border-radius: 3px 3px 3px 3px;
    color: #333333;
    display: none;
	font-size: 14px;
    left: 50%;
    margin-left: -402px;
    position: fixed;
    top: 20%;
    width: 800px;
    z-index: 999999999999999;
}
div.loader {
    background: url("../img/loading.gif") no-repeat scroll 0 0 transparent;
    height: 32px;
    width: 32px;
	display: none;
	z-index: 9999;
	top: 40%;
	left: 50%;
	position: absolute;
	margin-left: -10px;
}
div.close {
    background: url("../img/closebox.png") no-repeat scroll 0 0 transparent;
    bottom: 24px;
    cursor: pointer;
    float: right;
    height: 30px;
    left: 27px;
    position: relative;
    width: 30px;
}
span.ecs_tooltip {
    background: none repeat scroll 0 0 #000000;
    border-radius: 2px 2px 2px 2px;
    color: #FFFFFF;
    display: none;
    font-size: 11px;
    height: 16px;
    opacity: 0.7;
    padding: 4px 3px 2px 5px;
    position: absolute;
    right: -62px;
    text-align: center;
    top: -51px;
    width: 93px;
}
span.arrow {
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 7px solid #000000;
    display: block;
    height: 1px;
    left: 40px;
    position: relative;
    top: 3px;
    width: 1px;
}
div#popup_content {
    margin: 4px 7px;
}

JavaScript

/* 
	author: istockphp.com
*/
jQuery(function($) {
	
	$("a.topopup").click(function() {
			loading(); // loading
			setTimeout(function(){ // then show popup, deley in .5 second
				loadPopup(); // function show popup 
			}, 200); // .5 second
	return false;
	});


	
	/* event for close the popup */
	$("div.close").hover(
					function() {
						$('span.ecs_tooltip').show();
					},
					function () {
    					$('span.ecs_tooltip').hide();
  					}
				);
	
	$("div.close").click(function() {
		disablePopup();  // function close pop up
	});
	
	$(this).keyup(function(event) {
		if (event.which == 27) { // 27 is 'Ecs' in the keyboard
			disablePopup();  // function close pop up
		}  	
	});
	
	$("div#backgroundPopup").click(function() {
		disablePopup();  // function close pop up
	});
	
	$('a.livebox').click(function() {
		alert('Hello World!');
	return false;
	});
	

	 /************** start: functions. **************/
	function loading() {
		$("div.loader").show();  
	}
	function closeloading() {
		$("div.loader").fadeOut('normal');  
	}
	
	var popupStatus = 0; // set value
	
	function loadPopup() { 
		if(popupStatus == 0) { // if value is 0, show popup
			closeloading(); // fadeout loading
			$("#toPopup").fadeIn(0500); // fadein popup div
			$("#backgroundPopup").css("opacity", "0.7"); // css opacity, supports IE7, IE8
			$("#backgroundPopup").fadeIn(0001); 
			popupStatus = 1; // and set value to 1
		}	
	}
		
	function disablePopup() {
		if(popupStatus == 1) { // if value is 1, close popup
			$("#toPopup").fadeOut("normal");  
			$("#backgroundPopup").fadeOut("normal");  
			popupStatus = 0;  // and set value to 0
		}
	}
	/************** end: functions. **************/
}); // jQuery End