function current_menu( ){ 
    var page_href  = document.location.href;
    var menu = document.getElementById( 'sidebar'  );
    var anchors = menu.getElementsByTagName( 'a' );
    var anchor  = null;

   for ( i=0; i< anchors.length; i++ ){
       anchor = anchors[i];
	if ( anchor.href == page_href ){
	    anchor.style.color =  'black';
	    anchor.style.fontWeight = "bold";
	    return;
	}
	
    }

}