Close any open dialogs before opening a new one. Fixes ticket #1295.

lib/gallery.dialog.js

@@ -18,6 +18,9 @@
        var self = this;
        var eDialog = '<div id="g-dialog"></div>';
 
+       if ($("#g-dialog").length) {
+         $("#g-dialog").dialog("close");
+       }
        $("body").append(eDialog);
 
        if (!self.options.close) {