问题不在于 z-index，因为它们仅在 css 中将位置应用于元素时才有效。
问题在于透明效果。透明度小于 1 会产生（某种）较低的 z-index 效果。因此，当图片发生变化且透明时，元素位于 iframe 后面。更改 z-index 不会影响透明度。一个建议是进行以下设计更改。也许这可能会有所帮助，但我不确定。
<div id="main">
<div id="pictureGellary" style="position:relative; z-index:2"></div>
<div id="iframe" style="position:relative; z-index:1"></div>
<div>
编辑：更新后的 jquery.js 代码将解决问题
/*! fancyBox v2.1.5 fancyapps.com | fancyapps.com/fancybox/#license */
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请稍后再试。
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openMethod:"zoomIn",closeEffect:"fade",closeSpeed:250,closeEasing:"swing",closeOpacity:!0,closeMethod:"zoomOut",nextEffect:"elastic",nextSpeed:250,nextEasing:"swing",nextMethod :"changeIn",prevEffect:"elastic",prevSpeed:250,prevEasing:"swing",prevMethod:"changeOut",helpers:{overlay:!0,title:!0},onCancel:f.noop,beforeLoad:f .noop,afterLoad:f.noop,beforeShow:f.noop,afterShow:f.noop,beforeChange:f.noop,beforeClose:f.noop,afterClose:f.noop},group:{},opts:{},上一个：null，即将到来：null，当前：null，isActive:!1，
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b.close():d.close(),!1});this.overlay.css(a.css).show()},close:function(){var a,b;n.unbind("resize .overlay");this.el.hasClass("fancybox-lock")&&(f(".fancybox-margin").removeClass("fancybox-margin"),a=n.scrollTop(),b=n。 scrollLeft(),this.el.removeClass("fancybox-lock"),n.scrollTop(a).scrollLeft(b));f(".fancybox-overlay").remove().hide();f.扩展(this,{overlay:null,fixed:!1})},update:function(){var a="100%",b;this.overlay.width(a).height("100%"); I?(b=Math.max(G.documentElement.offsetWidth,G.body.offsetWidth),
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":not('.fancybox-item, .fancybox-nav')","click.fb-start",k);this.filter("[data-fancybox-start=1]").trigger("点击");return this};p.ready(function(){var a,d;f.scrollbarWidth===v&&(f.scrollbarWidth=function(){var a=f('').appendTo("body" ),b=a.children(),b=b.innerWidth()-b.height(99).innerWidth();a.remove();return b});if(f.support.fixedPosition=== v){a=f.support;d=f('').appendTo("body");var e=20===
d[0].offsetTop||15===d[0].offsetTop;d.remove();a.fixedPosition=e}f.extend(b.defaults,{scrollbarWidth:f.scrollbarWidth(),fixed: f.support.fixedPosition,parent:f("body")});a=f(r).width();J.addClass("fancybox-lock-test");d=f(r).width( );J.removeClass("fancybox-lock-test");f(".fancybox-margin{margin-right:"+(d-a)+"px;}").appendTo("head")})}) （窗口，文档，jQuery）；
还可以查看您在 Opera 和 safari 上的网站，玩家总是在这两个方面都处于领先地位。完全搞砸了。