We can just use isNaN for this check in the IE opacity code.

0da700a4 · jeresig · 6dd2dc42 · 0da700a4
Commit 0da700a4 authored Sep 27, 2010 by jeresig
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css.js src/css.js +1 -1

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--- a/src/css.js
+++ b/src/css.js
@@ -187,7 +187,7 @@ if ( !jQuery.support.opacity ) {
 			style.zoom = 1;

 			// Set the alpha filter to set the opacity
-			var opacity = parseInt( value, 10 ) + "" === "NaN" ?
+			var opacity = isNaN(value) ?
 				"" :
 				"alpha(opacity=" + value * 100 + ")";