function clear_search_form(){
    document.getElementById('keyword').value='';
    document.getElementById('from').value='';
    document.getElementById('to').value='';
    document.getElementById('wr_no').value='';
    document.getElementById('wr_contact').value='';
    document.getElementById('wr_contact_mc').value='';
    document.getElementById('wr_bldg').value='';
    document.getElementById('wr_dept').value='';
    document.getElementById('and').click();
}