JavasScript Game for Class

I'm having a lot trouble with writing my own Javascript code in an introductory compScie class. I have to make a game that checks a the colors that make up another color like purple = red and blue. I'm doing this by a checkbox in my html. However, I'm having trouble validating the answer because my code marks everything correct and lets the user continue on. So my game really is missing a big component to it.

var aColor =  ["purple", "pink", "orange", "yellow", "black", "turquoise"];
var obj = document.getElementById("BD");
var cColor_index= 0;
var cColor = "Color";
var changeState = 0;
var selchb = "n";
function getColors(frm){
     var gColor = [];
     var inputs = frm.getElementsByTagName('INPUT');
     var n_inputs = inputs.length;

    for(var i=0; i<n_inputs; i++) {
        if(inputs[i].type == 'checkbox' && inputs[i].checked == true) gColor.push(inputs[i].value);
    }

    return gColor;
}


function change() {
  cColor_index= parseInt( Math.random() * aColor.length);
  cColor = aColor[cColor_index];
  if (changeState <= 3) {
     obj.innerHTML = cColor;
   } else {
     obj.innerHTML = "Another Round?";
     changeState = 0;
}

document.getElementById('send').addEventListener("click", checkBoxArray);   


}

function checkBoxArray(){
 selchb = getColors(this.form);    
 if (cColor == "purple" && selchb.value == "red", "blue" ){
   obj.innerHTML = "Good Job, onto the next one";
   changeState++;
  }
 if (cColor == "black" && selchb.value == "red", "blue", "green" ){
   obj.innerHTML = "Good Job, onto the next one";
   changeState++;
  }
}