html - My JavaScript code crashes in Chrome, when script tries to make fixed element visible -

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i have added few elements "visibility:hidden; position:fixed;" top of page , reason, when launch script in chrome, makes "#pageoverlay" visible, fails unhide other elements. here js function fails:

function showimage(element) { //locating currentgalleryitemindex  (currentgalleryitemindex = firstgalleryitemindex; currentgalleryitemindex <= lastgalleryitemindex; currentgalleryitemindex++) {     if (galleryitems[currentgalleryitemindex] === element) break; }  //general settings  fillpreviewarea();  pageoverlay.style.visibility = "visible";  previewarea.style.visibility = "visible";  previewareacloselink.style.visibility = "visible";  previewareaactive = true; }

the same thing doesn't happen in firefox , ie11 , works in chrome if change "position:fixed;" "position:absolute;"; isn't want use.

the page uses script here:

http://spongebobia.com/spongebob-captures/gallery.php

and actual script here:

http://spongebobia.com/spongebob-captures/scripts/previewarea.js

how make work while keeping "position: fixed;"?

it's "z-index". pageoverlay's css should this:

#pageoverlay {     background: gray;     width: 100%;     height: 100%;     z-index: 500;     top: 0px;     left: 0px;     position: fixed;     visibility: hidden;     z-index: 2; }

and previewareacontainer this:

#previewareacontainer {     position: fixed;     visibility: hidden;     top: 10px;     left: 50%;     margin-left: -344px;     width: 670px;     height: 540px;     z-index: 3; }

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