how to give opacity on area map

i am having a problem with html opacity ..

currently i have applied opacity using css but its not working my html and css code is below..

<area shape ="rect" class="transbox" coords ="0,0,30,22"
href ="test1.htm"  target ="_blank" opacity="0.5"    />

area{
 opacity: 0.6;
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha开发者_如何学Go(Opacity=60)";
filter: alpha(opacity=60);
-moz-opacity: 0.60;
-khtml-opacity: 0.6;
}

any one have idea about it?

Thanks in advance

---

I don't think you can change opacity per area element.

However, you could still achieve an effect with mapper.js.