<div>
<div class="content wysiwyg-content">
Using JavaScript, how can I do this:<br />

<pre><code id="code-604993">#modalOverlay {
	filter:alpha(opacity=70); 
}
</code></pre>
</div>
</div>


IE JavaScript/CSS: filter:alpha(opacity=70);

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.