function show_btn_back() {
    var output = '';

    output += '<span class="button_back"><a class="but_back">Terug</a></span>'+"\n";
    document.write(output);
}

function show_btn_back_intra() {
    var output = '';

    output += '<span class="button_back"><a class="but_back"></a></span>'+"\n";
    document.write(output);
}

function show_btn_print() {
    var output = '';

    output += '<span class="button_print"><a class="but_print"></a></span>'+"\n";
    document.write(output);
}

$(document).ready(function(){
    $('a.but_back').click(function(e){
        e.preventDefault();
        history.go(-1);
    });
    
    $('a.but_print').click(function(e) {
        e.preventDefault();
        window.print();
    }); 
});

$(document).ready(function() {

    var text = "Zoeken op trefwoord";

    $("#search_trefwoord").attr("value", text);
    $("#search_trefwoord").css('font-style', 'italic');
    $("#search_trefwoord").css('font-size', '110%');   

    $("#search_trefwoord").focus(function() {
        $(this).addClass("active");
        if($(this).attr("value") == text){
            $(this).attr("value", "");
        }
        $("#search_trefwoord").css('font-style', 'normal');
        $("#search_trefwoord").css('font-size', '120%');
    }         
);

    $("#search_trefwoord").blur(function() {
        $(this).removeClass("active");
        if($(this).attr("value") == ""){
            $(this).attr("value", text);
        }
        $("#search_trefwoord").css('font-style', 'italic');
        $("#search_trefwoord").css('font-size', '110%');
    }         
);    
});