CSS syntax issue

hi,

in my css file I have the following entry:

css:
.disabledImg {
  opacity: 0.4;
  filter: alpha(opacity=40);
}

html:
<img class="disabledImg" ....../>

The filter: .... entry is for IE versions  <= 8 to handle opacity.

I get warnings from the GWT compiler:
 [WARN] ... encountered "=". Was expecting one of: "+" "-" "," "/" ")" <STRING> <IDENT> <NUMBER> <URL> <PERCENTAGE> <PT> <MM> <CM> <PC> <IN> <PX> <EMS> <EXS> <DEG> <RAD> <GRAD> <MS> <SECOND> <HZ> <KHZ> <DIMEN> <HASH> <UNICODERANGE> <FUNCTION>
 
And the css class seems to not work. In the end I had to add the filter...  statement to the style attribute of the img tag.

TIA
Kibu

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