Fixes #1034 - Check for style.removeAttribute before calling it

Fixes issue in non IE browsers that happen to come down this path

src/css.js

@@ -534,7 +534,8 @@ if ( !jQuery.support.opacity ) {
			style.zoom = 1;

			// if setting opacity to 1, and no other filters exist - attempt to remove filter attribute #6652
			if ( value >= 1 && jQuery.trim( filter.replace( ralpha, "" ) ) === "" ) {
			if ( value >= 1 && jQuery.trim( filter.replace( ralpha, "" ) ) === "" &&
				style.removeAttribute ) {

				// Setting style.filter to null, "" & " " still leave "filter:" in the cssText
				// if "filter:" is present at all, clearType is disabled, we want to avoid this