Openlayers showPopup()

Asset.php

Drupal.settings.nid = Drupal.settings.nid || [];
Drupal.settings.getAllFeature;

function my_map() {

  var all_layers = Drupal.openlayers.popup.popupSelect.layers;
  for(var key1 in all_layers) {
    var current_layer = all_layers[key1];
	var all_features_in_layer = current_layer.features;
	for(var key2 in all_features_in_layer) {
	  var current_feature = all_features_in_layer[key2];
	  Drupal.settings.nid[current_feature.attributes.nid] = current_feature;
	}
  }
}

function show_popup(nid) {
  if (Drupal.settings.nid) {
  var feature = Drupal.settings.nid[nid];
  Drupal.openlayers.popup.popupSelect.clickFeature(feature);
  }

}

$(document).ready(function(){
    my_map();
});

//from http://drupal.org/node/1009374#comment-6200888