function rewriteYeargroupTitles(){
        //alert( 'rewriting yeargroup titles' );
        url = "/region.php";
        ajax( url , '' , rewriteYeargroupTitles2 );
}
function rewriteYeargroupTitles2( data ){
        var namescheme = data.substring( 19 , 20 );
        var prefix = false;
        var k = 0;
        if( 'y' == namescheme ){
                prefix = 'Year ';
                k = 1;
        }
        if( 'p' == namescheme ){
                prefix = 'p ';
                k = 2;
        }
        if( prefix ){
                for( var i=0 ; i<6 ; i++ ){
                        var yearno = i + k;
                        var label = prefix + yearno;
                        var id = 'navlabel' + ( i + 1 );
                        var element = document.getElementById( id );
                        if( element ){
                                element.innerHTML = label;
                        }
                }
        }
}