Change icon for style/Format/Font/Size

I would like to know is there a way to replace the icon for style/format/font/size toolbar item?

i know that using the code "new FCKToolbarFontsCombo( null, FCK_TOOLBARITEM_ONLYTEXT )", we can display only the text and not the drop down options. What if i want to display some icons instead of the text like "Style" ? Can i do that using the similar code?

Thanks.