I have this hover effect for all my images, but when i try to validate it, there are errors only in IE. is there a fix for this problem?

Heres the coding

a img {
filter:alpha(opacity=60);
-moz-opacity: 0.6;
opacity: 0.6;}

a:hover img {
filter:alpha(opacity=100);
-moz-opacity: 1.0;
opacity: 1.0;
}


Heres the Errors:


URI : http://www.bkflash.com/styles.css

* Line: 105 Context : a img

Parse Error - opacity=60)
* Line: 106 Context : a img

Parse Error - -moz-opacity: 0.6;
* Line: 109

Parse Error - : 0.6;} a:hover img
* Line: 110

Parse Error - opacity=100)
* Line: 111

Parse error - Unrecognized : -moz-opacity: 1.0;
* Line: 113

Parse Error - : 1.0; }



Anybody know a fix???