JavaScript Score value not increasing
<p>I'm programming a small name the picture game in HTML and JavaScript and i'm having a bit of a problem with getting the score value to increase when the user gets the answer right, the score value doesn't increase so the stars aren't changing when getting the answer correct.I have provided my code so far and any help would be greatly appreciated</p>

<pre><code>&lt;script language="javascript"&gt;
var Pics;
var Score = 0;

function btnStart_onClick() {
    document.getElementById("btnBS").disabled = false;
    document.getElementById("btnBW").disabled = false;
    document.getElementById("btnCP").disabled = false;
    document.getElementById("btnFP").disabled = false;
    document.getElementById("btnPH").disabled = false;
    document.getElementById("btnPW").disabled = false;
    document.getElementById("btnRD").disabled = false;
    document.getElementById("btnTP").disabled = false;
    document.getElementById("btnTS").disabled = false;
    document.getElementById("btnYH").disabled = false;
    document.getElementById("btnStart").disabled = true;
    document.getElementById("Ptxt").innerHTML = "What is the above symbol?"
    Pics = Math.floor(Math.random() * 10) + 1

    if (Pics == 0)
        "MapSym_blank.jpg"
    else if (Pics == 1)
        Picture.src = "MapSym_BS.jpg"
    else if (Pics == 2)
        Picture.src = "MapSym_BW.jpg"
    else if (Pics == 3)
        Picture.src = "MapSym_CP.jpg"
    else if (Pics == 4)
        Picture.src = "MapSym_FP.jpg"
    else if (Pics == 5)
        Picture.src = "MapSym_PH.jpg"
    else if (Pics == 6)
        Picture.src = "MapSym_PW.jpg"
    else if (Pics == 7)
        Picture.src = "MapSym_RD.jpg"
    else if (Pics == 8)
        Picture.src = "MapSym_TP.jpg"
    else if (Pics == 9)
        Picture.src = "MapSym_TS.jpg"
    else if (Pics == 10)
        Picture.src = "MapSym_YH.jpg"
}
function btnBS_onClick() {
    document.getElementById("btnBS").disabled = true;
    document.getElementById("btnBW").disabled = true;
    document.getElementById("btnCP").disabled = true;
    document.getElementById("btnFP").disabled = true;
    document.getElementById("btnPH").disabled = true;
    document.getElementById("btnPW").disabled = true;
    document.getElementById("btnRD").disabled = true;
    document.getElementById("btnTP").disabled = true;
    document.getElementById("btnTS").disabled = true;
    document.getElementById("btnYH").disabled = true;
    document.getElementById("btnStart").disabled = false;

    if (Pics == 1) {
        document.getElementById("Ptxt").innerHTML = "Congratulations"
        Score += 1
    }
    else document.getElementById("Ptxt").innerHTML = "Try Again"
}
    function btnBW_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 2) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnCP_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 3) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnFP_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 4) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnPH_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 5) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnPW_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 6) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnRD_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 7) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnTP_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 8) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnTS_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 9) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }
    function btnYH_onClick() {
        document.getElementById("btnBS").disabled = true;
        document.getElementById("btnBW").disabled = true;
        document.getElementById("btnCP").disabled = true;
        document.getElementById("btnFP").disabled = true;
        document.getElementById("btnPH").disabled = true;
        document.getElementById("btnPW").disabled = true;
        document.getElementById("btnRD").disabled = true;
        document.getElementById("btnTP").disabled = true;
        document.getElementById("btnTS").disabled = true;
        document.getElementById("btnYH").disabled = true;
        document.getElementById("btnStart").disabled = false;

        if (Pics == 10) {
            document.getElementById("Ptxt").innerHTML = "Congratulations"
            Score += 1
        }
        else document.getElementById("Ptxt").innerHTML = "Try Again"
    }

    if (Score == 1) {
        SOff1.src = "StarOn.gif"
    }
    if (Score == 2) {
        SOff1.src = "StarOn.gif"
        SOff2.src = "StarOn.gif"
    }
    if (Score == 3) {
        SOff1.src = "StarOn.gif"
        SOff2.src = "StarOn.gif"
        Soff3.src = "StarOn.gif"
    }
    if (Score == 4) {
        SOff1.src = "StarOn.gif"
        SOff2.src = "StarOn.gif"
        Soff3.src = "StarOn.gif"
        Soff4.src = "StarOn.gif"
    }
    if (Score == 5) {
        SOff1.src = "StarOn.gif"
        SOff2.src = "StarOn.gif"
        Soff3.src = "StarOn.gif"
        Soff4.src = "StarOn.gif"
        Soff5.src = "StarOn.gif"
    }
&lt;/script&gt;
</code></pre>