Change CSS class attribute value at runtime

Hi,

Can anyone help me to change the value of a class at runtime. So, for
example, I have a css class that I apply to certain objects:-

.highlight {color: blue;}

And at runtime I would like to change the 'color' attribute of this
class. So effectively making this:-

.highlight { color: yellow;}

I want to use something similar to this javascript this function:-
changecss(theClass,element,value)

Or can anyone suggest how I can use that javascript function ? I tried
this, but it failed:-

private native void changeCSS() /*-{
$doc.changecss('.highlight','color','yellow');
}-*/;

Thanks in advance,
Martin.

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