function checkaq(el) {
    var list = document.getElementById("ddl_" + el);
    var tdst = document.getElementById("tdst_" + el);
    list.disabled = true;

    tdst.style.display = "inline";
    if (list.options[list.selectedIndex].value == "0") {
        tdst.innerHTML = "<font color=red><b>Incorrect!</b> The answer is: " + tdst.innerHTML + "</font>";
    } else {
        tdst.innerHTML = "Correct!";
    }
}
function chk() {
    for (i = 0; i < 10; i++) {
        if (document.getElementById("ddl_" + i) != null) {
            var list = document.getElementById("ddl_" + i);
            if (list.disabled == false) {
                alert("Please complete this quiz first!")
                return false;
            }
        }
    }
    return true
}