change order of conditions checking in curCSS to avoid unnecessary lookouts

[kowcik]

cur CSS in version 1.4.2

curCSS: function( elem, name, force ) { var ret, style = elem.style, filter;

IE uses filters for opacity if ( !jQuery.support.opacity && name === "opacity" && elem.currentStyle ) { ...

it seems every time this function is called, there is a check made on jQuery.support.opacity. Proposed enhacement:

curCSS: function( elem, name, force ) { var ret, style = elem.style, filter;

IE uses filters for opacity if ( name === "opacity" && !jQuery.support.opacity && elem.currentStyle ) { ...

[john]

This was fixed in the CSS rewrite that just landed.