Problem with font-weight: bold in opera ?

Hi Everyone !
I am working on a layout and everything is done but the problem is coming when i checked my layout on the opera browser. The text in my content box which i set on font-weight: bold; is working on mozilla and other browser but its not working on opera it disturber the other division. When i checked it from fire bug the font-weight is not bold it show 700px instead of its bold. So, help me guyz nd tell what should i do ?

You should check if you have right font class, are you sure it is Arial but not arial bold !