function checkFields(f) {
missinginfo = "";
if (f.user.value.length < 1)
{
    missinginfo += "\n     -  DRN";
}
if (f.pass.value.length < 1)
{
    missinginfo += "\n     -  Password";
}
if (missinginfo != "") {
missinginfo = "You failed to correctly fill in your:\n" +
missinginfo + "\n\nPlease re-enter and submit again!";
alert(missinginfo);
return false;
}
else return true;
}