cinema4d,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
.orange {
background: #FFCC00;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function(){
var s = $("#general-class a"), d = $('.close');
s.click(function(event) {
event.stopPropagation();
$('.'+this.className.replace('open','modal')).addClass("orange");
});
d.click(function(event) {
event.stopPropagation();
$(this).parents('[class^="modal-window"]').removeClass("orange");
});
});
</script>
</head>
<body>
<div id="modal-window" class="modal-window">
<div class="window-container animation">
<div style="float:left; padding:5px;"><img src="img/wh.jpg"/></div>
<div style="float:left; padding:5px;"><img src="img/lg.jpg"/></div>
<div style="float:left; padding:5px;"><img src="img/gl.jpg"/></div>
<div style="float:left; padding:5px;"><img src="img/wh.jpg"/></div>
<a href="#" class="close"><img src="img/right.png" /></a>
</div>
</div>
<div id="modal-window" class="modal-window_a">
<div class="window-container animation">
<div style="float:left; padding:5px;"><img src="img/a.png"/>
<p style="color:#333333">A 45 AMG</p>
</div>
<a href="#" class="close">close<img src="img/right.png" /></a>
</div>
</div>
<div id = "general-class">
<p class = "button_cl"><a class="open-window_a" href="#">open A </a></p>
<p class = "button_cl"><a class="open-window_c" href="#"> C </a></p>
<p class = "button_cl"><a class="open-window_cla" href="#"> CLA </a></p>
<p class = "button_cl"><a class="open-window_e" href="#"> E </a></p>
<p class = "button_cl"><a class="open-window_g" href="#"> G </a></p>
<p class = "button_cl"><a class="open-window_gl" href="#"> GL </a></p>
<p class = "button_cl"><a class="open-window_gla" href="#"> GLA </a></p>
<p class = "button_cl"><a class="open-window_ml" href="#"> ML </a></p>
<p class = "button_cl"><a class="open-window_s" href="#"> S </a></p>
<p class = "button_cl"><a class="open-window_sl" href="#"> SL </a></p>
<p class = "button_cl"><a class="open-window_slk" href="#"> SLK </a></p>
<p class = "button_cl"><a class="open-window_gt" href="#"> GT </a></p>
</div>
</body>
</html>