function show_btn_back(path) {
    var output = '';
    output += '<a class="but_back"><img src="'+path+'/icon-back.png" alt="Terug"></a>'+"\n";
    document.write(output);
}

function show_print(path) {
    var output = '';
    output += '<a class="btn_print" href="#print"><img src="'+path+'/icon-print.png" alt="Terug"></a>'+"\n";
    document.write(output);
}

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