well what happens when you try to run it what's going wrong

// Code here

// Code here

var ct = nil

elements.customtemp = {
    color: ["#FF0000", "#FF6600", "#FFCC00", "#FFFF00", "#CCFF00", "#66FF00", "#00FF00", "#00FF66", "#00FFCC", "#00FFFF"],
    onSelect: function() {
        var answer4 = prompt("Please input the desired temperature to reach.",(ct||undefined));
        if (!answer4) { return }
        ct = answer4;
    },
    tool: function(pixel) {
        if(shiftDown) { pixel.temp = 100 } else { pixel.temp = ct }
        pixelTempCheck(pixel)
    },
    category: "tools",
};

var ct = nil

elements.customtemp = {
    color: ["#FF0000", "#FF6600", "#FFCC00", "#FFFF00", "#CCFF00", "#66FF00", "#00FF00", "#00FF66", "#00FFCC", "#00FFFF"],
    onSelect: function() {
        var answer4 = prompt("Please input the desired temperature to reach.",(ct||undefined));
        if (!answer4) { return }
        ct = answer4;
    },
    tool: function(pixel) {
        if(shiftDown) { pixel.temp = 100 } else { pixel.temp = ct }
        pixelTempCheck(pixel)
    },
    category: "tools",
};