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set opacity of background color of div that works in ie7
Making Internet Explorer use PNG Alpha transparency
javascript - How is IE7 any better than IE6? - Stack Overflow
CSS Opacity: A Comprehensive Reference - Impressive Webs
How do I reduce the opacity of an element's background using CSS?
Javascript: changing opacity using .style.filter = 'alpha(opacity ...
PNG Transparency in Internet Explorer
Fixing Browser Compatibility Issues With CSS Opacity & RGBA
What is the difference between "opacity" and "filter: opacity()"
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader