Sort Option Set (Picklist) on the CRM Form

/* Code to Sort Option List */

function sortList() {
    var lb = document.getElementById("fslr_custompicklist");
    arrTexts = new Array();
    arrValues = new Array();
    arrID = new Array();
    var len = lb.length;
    for (i = 0; i < len; i++) {
        arrTexts[i] = lb.options[i].text;
        arrValues[i] = lb.options[i].value;
        arrID[i] = lb.options[i].text;
    }
    arrID.sort();

    for (i = 0; i < lb.length; i++) {
        lb.options[i].text = arrID[i];
        for (j = 0; j < arrValues.length; j++) {
            if (arrTexts[j] == arrID[i]) {
                lb.options[i].value = arrValues[j];
                break;
            }
        }
    }
}