/* author: Gary Mould */
/* Creation date: 09/03/2007 */
function show_div(div_id) {
    // hide all the divs
    document.getElementById('dropdown_clear').style.display = 'none';
    document.getElementById('dropdown_one').style.display = 'none';
	document.getElementById('dropdown_two').style.display = 'none';
  
    // show the requested div
    document.getElementById(div_id).style.display = 'block';
}