function highlight_left_nav() {
 
    var current_page = window.location.pathname;
 
    var u = $('left_nav').getElementsByTagName('ul')[0];
    
    if (!u) return;
    
    var lis = u.getElementsByTagName('li');
    for( var i=0; i<lis.length; i++ ){

	var this_page = lis[i].getElementsByTagName('a')[0];

        var current_page_ary = String(current_page).split('/');
        var this_page_ary = String(this_page).split('/');

        var current_action = current_page_ary.pop();
        var this_action = this_page_ary.pop();
		
        if (current_action == this_action) {
            this_page.className = 'active_link';
        } 
    }
}


function highlight_left_link(num) {
    var u = $('left_nav').getElementsByTagName('ul')[0];
    var lis = u.getElementsByTagName('li');
    var this_page = lis[num-1].getElementsByTagName('a')[0];
    this_page.className += 'active_link';
}