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.transparent_class {filter:alpha(opacity=50);-moz-opacity:0.5;-khtml-opacity: 0.5;opacity: 0.5;}
The above attributes are :
opacity: 0.5; This is the most important because it is a CSS standard. This property supports firefox, Safari and Opera.
filter:alpha(opacity=50); This is for Set by IE6, the possible values are 0-100, and the other three are 0 to 1.
-moz-opacity:0.5; This is to support some older versions of the Mozilla browser.
-khtml-opacity: 0.5; This is to support some older versions of Safari browser.