// JavaScript Document

function is_empty(element, message){
	if(element.value == ""){
		alert(message);
		element.focus();
		return true;
	} else {
		return false;
	}
}

// Toggles the visibility of the <tr> containing textbox with id = textbox_id, if the selection of the select with id = selection_id is "Others", or 26.
function toggle_visibility(textbox_id, selection_id) {
	if(document.getElementById(selection_id).value == 26)
		document.getElementById(textbox_id).style.display = '';
  else
    document.getElementById(textbox_id).style.display = 'none';
}