function changeSpeed(value){
    speed = value;
    console.log("speed is now: " + speed);
    if(running == true){
        clearTimeout(timer);
        timer = setTimeout(next_instruction, speed);
    }
    
}



function next_instruction(){
    if(step == (steps.length)){
        return;
    }

    show_instruction();
    
    step = step + 1;
    if(step < (steps.length )){ 
        clearTimeout(timer);
        timer = setTimeout(next_instruction, speed);
    }
    else{ //end 
        step = step - 1;
//         console.log("last step");            
//         show_instruction();
    }
}


function show_instruction(){
    
//     document.getElementById("next").disabled = true; 
//     $("#next").disabled = true;         
    
    var active_line;
    var shown_step;
    $("#init_box_content").hide();
    $(".step_boxes").hide();
    
    if(step < steps.length){
        active_line = steps[step];
        shown_step = step + 1;
    }
    else{ //end 
        active_line = 0;
        shown_step = step;
    }
    
    $("#step_" + (step + 1) + "_box").show();
    
    if(shown_step == 1){
        document.getElementById("previous").disabled = true;  
    }
    else if(shown_step == steps.length){
        document.getElementById("next").disabled = true;      
        console.log("last step (" + shown_step + "/" + steps.length + ": \"" + steps[step] + "\"), disable 'next' button"); 
    }
    else{       
        document.getElementById("previous").disabled = false;  
        document.getElementById("next").disabled = false; 
    }
        
    hrmv.setActiveLine(active_line);
    console.log("current step: " + shown_step + "/" + steps.length + ": \"" + steps[step] + "\" => Set active line to " + active_line + " and show step " + shown_step + " => " + "#step_" + (shown_step) + "_box");            
}




function init_cpu(summary, program_quality){
    var init_box_content = $("#init_box_content").html();
    var style ="<div class=\"hrmcode\">";
    
//     if(init_step == 0){
//         init_box_content = init_box_content + "<br>Initializing CPU...<br>";
//     }
    if(init_step == 1){
        init_box_content = init_box_content + style + "Überprüfe Hand...<br>";
    }
    else if(init_step == 2){
        init_box_content = init_box_content + style + "Überprüfe Daten-Register...<br>";
    }
//             else if(init_step == 2){
//                 init_box_content = init_box_content + "1... ";
//             }
//             else if(init_step == 3){
//                 init_box_content = init_box_content + "2... ";
//             }
//             else if(init_step == 4){
//                 init_box_content = init_box_content + "3... </br>";
//             }
    else if(init_step == 3){
        init_box_content = init_box_content + style + "Überprüfe Inbox...<br>";
    }
    else if(init_step == 4){
        init_box_content = init_box_content + style + "Überprüfe Outbox...<br>";
    }
    else if(init_step == 5){
        init_box_content = init_box_content + style + "Lade Programm...<br>";
    }
    else if(init_step == 6){
        init_box_content = init_box_content + style + summary + "<br>";
        if(program_quality == 0){
            $("#init_box_content").html(init_box_content);
            return;
        }
    }
    else{ //last step
        init_box_content = init_box_content + style + "Drücke Play um das Programm zu starten";
        $("#init_box_content").html(init_box_content);
        $("#play").show();
//         $("#pause").show();
        $("#reset").show();
        $("#previous").show();
        $("#next").show(); 
        $("#slider_control").show();
        document.getElementById("previous").disabled = true; 
        document.getElementById("next").disabled = false; 
        return;
    }
    
    $("#init_box_content").html(init_box_content);
    
    init_step = init_step + 1;
    timer = setTimeout(init_cpu, 500, summary, program_quality);        
}