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    <p>For a really simple dialog, checkout this code: <a href="http://snippets.dzone.com/posts/show/3411" rel="nofollow noreferrer">http://snippets.dzone.com/posts/show/3411</a></p> <p>Very minimal and simple - just what I wanted.</p> <p>The code went through a few modifications. Here's the final version that worked for me:</p> <pre><code>/* * Adapted from http://snippets.dzone.com/posts/show/3411 */ var Dialog = {}; Dialog.Box = Class.create(); Object.extend(Dialog.Box.prototype, { initialize: function(id) { this.createOverlay(); this.dialog_box = $(id); this.dialog_box.show = this.show.bind(this); this.dialog_box.persistent_show = this.persistent_show.bind(this); this.dialog_box.hide = this.hide.bind(this); this.parent_element = this.dialog_box.parentNode; this.dialog_box.style.position = "absolute"; var e_dims = Element.getDimensions(this.dialog_box); var b_dims = Element.getDimensions(this.overlay); this.dialog_box.style.left = ((b_dims.width/2) - (e_dims.width/2)) + 'px'; this.dialog_box.style.top = this.getScrollTop() + ((this.winHeight() - (e_dims.width/2))/2) + 'px'; this.dialog_box.style.zIndex = this.overlay.style.zIndex + 1; }, createOverlay: function() { if ($('dialog_overlay')) { this.overlay = $('dialog_overlay'); } else { this.overlay = document.createElement('div'); this.overlay.id = 'dialog_overlay'; Object.extend(this.overlay.style, { position: 'absolute', top: 0, left: 0, zIndex: 90, width: '100%', backgroundColor: '#000', display: 'none' }); document.body.insertBefore(this.overlay, document.body.childNodes[0]); } }, moveDialogBox: function(where) { Element.remove(this.dialog_box); if (where == 'back') this.dialog_box = this.parent_element.appendChild(this.dialog_box); else this.dialog_box = this.overlay.parentNode.insertBefore(this.dialog_box, this.overlay); }, show: function(optHeight/* optionally override the derived height, which often seems to be short. */) { this.overlay.style.height = this.winHeight()+'px'; this.moveDialogBox('out'); this.overlay.onclick = this.hide.bind(this); this.selectBoxes('hide'); new Effect.Appear(this.overlay, {duration: 0.1, from: 0.0, to: 0.3}); this.dialog_box.style.display = ''; this.dialog_box.style.left = '0px'; var e_dims = Element.getDimensions(this.dialog_box); this.dialog_box.style.left = (this.winWidth() - e_dims.width)/2 + 'px'; var h = optHeight || (e_dims.height + 200); this.dialog_box.style.top = this.getScrollTop() + (this.winHeight() - h/2)/2 + 'px'; }, getScrollTop: function() { return (window.pageYOffset)?window.pageYOffset:(document.documentElement &amp;&amp; document.documentElement.scrollTop)?document.documentElement.scrollTop:document.body.scrollTop; }, persistent_show: function() { this.overlay.style.height = this.winHeight()+'px'; this.moveDialogBox('out'); this.selectBoxes('hide'); new Effect.Appear(this.overlay, {duration: 0.1, from: 0.0, to: 0.3}); this.dialog_box.style.display = ''; this.dialog_box.style.left = '0px'; var e_dims = Element.getDimensions(this.dialog_box); this.dialog_box.style.left = (this.winWidth()/2 - e_dims.width/2) + 'px'; }, hide: function() { this.selectBoxes('show'); new Effect.Fade(this.overlay, {duration: 0.1}); this.dialog_box.style.display = 'none'; this.moveDialogBox('back'); $A(this.dialog_box.getElementsByTagName('input')).each( function(e) { if (e.type != 'submit' &amp;&amp; e.type != 'button') e.value = ''; }); }, selectBoxes: function(what) { $A(document.getElementsByTagName('select')).each(function(select) { Element[what](select); }); if (what == 'hide') $A(this.dialog_box.getElementsByTagName('select')).each(function(select){Element.show(select)}) }, winWidth: function() { if (typeof window.innerWidth != 'undefined') return window.innerWidth; if (typeof document.documentElement != 'undefined' &amp;&amp; typeof document.documentElement.clientWidth != 'undefined' &amp;&amp; document.documentElement.clientWidth != 0) return document.documentElement.clientWidth; return document.getElementsByTagName('body')[0].clientWidth }, winHeight: function() { if (typeof window.innerHeight != 'undefined') return window.innerHeight if (typeof document.documentElement != 'undefined' &amp;&amp; typeof document.documentElement.clientHeight != 'undefined' &amp;&amp; document.documentElement.clientHeight != 0) return document.documentElement.clientHeight; return document.getElementsByTagName('body')[0].clientHeight; } }); </code></pre>
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