<script type="text/javascript" charset="utf-8">
function shuffle(array) {
 var currentIndex = array.length, temporaryValue, randomIndex;
 // While there remain elements to shuffle...
 while (0 !== currentIndex) {
 // Pick a remaining element...
 randomIndex = Math.floor(Math.random() * currentIndex);
 currentIndex -= 1;
 // And swap it with the current element.
 temporaryValue = array[currentIndex];
 array[currentIndex] = array[randomIndex];
 array[randomIndex] = temporaryValue;
 }
 return array;
}
 
$(document).on('ready pjax:scriptcomplete',function(){
    // Fill the arrays
    var arrA = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L"];
    var arrB = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l"];
    // Shuffle the arrays
    arrA = shuffle(arrA);
    arrB = shuffle(arrB);
 
    // Take the first 6 elements from both arrays, concat them and shuffle again
    var arrA1 = arrA.slice(0,6);
    var arrB1 = arrB.slice(0,6);
    var arr1 = arrA1.concat(arrB1);
    arr1 = shuffle(arr1).join('');;
 
    // Take the last 6 elements from both arrays, concat them and shuffle again
    arrA1 = arrA.slice(6,6);
    arrB1 = arrB.slice(6,6);
    var arr2 = arrA1.concat(arrB1);   
    arr2 = shuffle(arr2).join('');
 
    // Fill the text question
    $('#question{QID} input[type="text"]:eq(0)').val(arr1);
    $('#question{QID} input[type="text"]:eq(1)').val(arr2);
 
    // Remove the slashes in the next line 
//    $('#question{QID}').hide();
 });
</script>

$('#question{QID} input[type="text"]:eq(0)').val(arr1).trigger('keyup');