function get_query_variable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  } 
  return "";
}
function get_omni_events() {
  try {
    return omni_events.join(";");
  } catch(e) {
    return "";
  }
}

function add_omni_event(event_name) {
  try {
    omni_events.push(event_name);
  } catch(e) {
    omni_events = new Array(event_name);	
  }
}