function show(hidden_div,form_element) {
document.getElementById(hidden_div).style.display='block';
document.getElementById(form_element).focus();
}
function hide(hidden_div) {
document.getElementById(hidden_div).style.display='none';
}
function showhide(hidden_div,visible_div) {
document.getElementById(hidden_div).style.display='block';
document.getElementById(visible_div).style.display='none';
}