function changeCSS( titles, defaults ) {

     if ( !titles || (titles == '') ) return;

     if ( !defaults || (defaults == '') )
         defaults = false;

     titles = titles.split('|');

     if ( document.getElementsByTagName )
         x = document.getElementsByTagName('link');
     else if ( document.all )
         x = document.all.tags('link');
     else {
         alert('This script does not work in your browser');
         return;
     }

     for ( var t=0; t<titles.length; t++ ) {
         var title = titles[t];
         for ( var i=0; i<x.length; i++ ) {
             var xtitle = x[i].title;
             var dis = !(xtitle == title);
             if ( defaults && (xtitle=='default') ) dis = false;
             x[i].disabled = dis;
         }
     }
}