function uncheck_all_jobtypes()
{

    var jobtype_total = document.psform.jobtype.length;

    for (i = 0; i < jobtype_total; i++)
    {
        if (document.psform.jobtype[i].value != "E")
        {
            document.psform.jobtype[i].checked = false;
        }
    }
}

function uncheck_jobtype_all()
{
    var jobtype_total = document.psform.jobtype.length;

    for (i = 0; i < jobtype_total; i++)
    {
        if (document.psform.jobtype[i].value == "E")
        {
            document.psform.jobtype[i].checked = false;
        }
    }
}