https://www.bulhary.cz/www/jskripty/colorbox.js

1function ZjistiVelikost(velikost) {
2
3    var aktaulniSirka;
4    var novaVelikost;
5
6    if ($(window).width() > 1100) {
7        aktaulniSirka = 1100 - 125;
8    }
9    else {
10        aktaulniSirka = $(window).width() - 125;
11    }
12
13    if(velikost == 'sirka') {
14        novaVelikost = aktaulniSirka;
15    }
16    else if(velikost == 'vyska') {
17        novaVelikost = (aktaulniSirka / 16) * 9;
18    }
19
20    return novaVelikost;
21
22}
23
24$(document).ready(function() {
25
26	$(".colorbox").colorbox({  
27    
28        transition: "none", 
29        fixed: true,
30        maxWidth: "100%",  
31        maxHeight: "100%", 
32		fadeOut: 300,
33        current: "{current} / {total}",  
34        previous: "‹",  
35        next: "›",  
36        close: "zavřít",
37		rel: function() { return $(this).data('rel')}
38	
39    });  
40
41    $('.colorbox-video').colorbox({iframe: true, fixed: true, innerWidth: ZjistiVelikost('sirka'), innerHeight: ZjistiVelikost('vyska'), close: "zavřít", href:function(){
42            return this.href;
43    }});
44    
45    $('.colorbox-youtube').colorbox({iframe: true, fixed: true, innerWidth: ZjistiVelikost('sirka'), innerHeight: ZjistiVelikost('vyska'), close: "zavřít", href:function(){
46        var videoId = new RegExp('[\\?&]v=([^&#]*)').exec(this.href);
47        if (videoId && videoId[1]) {
48            return `https://www.youtube.com/embed/${videoId[1]}?HD=1;`;
49        }
50    }});
51
52});
53
54$(window).resize(function () {
55    
56    $('.colorbox-youtube').colorbox.resize({
57        innerWidth: ZjistiVelikost('sirka'),
58        innerHeight: ZjistiVelikost('vyska')
59    });
60
61    $('.colorbox-video').colorbox.resize({
62        innerWidth: ZjistiVelikost('sirka'),
63        innerHeight: ZjistiVelikost('vyska')
64    });
65
66});