how to make underline word by gtk1.2

[xiening <xiening topshine com cn>]

dear sir/madam:
while I use GtkText in my application I use
*******************************************
void
setFontX ( GtkWidget * widget, gint fontNumber )
{
   GtkStyle *thisStyle;

   thisStyle = gtk_style_copy( gtk_widget_get_style( widget));

   if ( fontNumber == 14 ) {
         thisStyle->font =gdk_fontset_load( medium_font[3] );
   }else{
         thisStyle->font 
=gdk_fontset_load("-adobe-helvetica-medium-r-normal--16-*-*-*-*-*-iso8859-1,\
                                 
-*-*-medium-r-normal--16-*-*-*-*-*-gb2312.1980-0"); 
   }
  
   gtk_widget_set_style( widget, thisStyle); 
}
****************************************
to set the font by bold, medium.

how to make underline word?
**********************************
I know in the gtk2.x
pango could solve this problem, very easy. and beg you pardon, how about 
gtk1.2

thank you.

xn