* try to implement size negotiations with the plugin that sends javascript
to the browser.
+* access object's attribute and <PARAM> children. Jean claims he does
+ this already, but the code seems to access GLib properties only,
+ no external params
+
+* implement a size negotiation mechanism from the plugin using
+ javascript. The plugin understands its ID from the object element,
+ calculates the size and sends a URL with a javascript call to a function
+ that sets width, height attributes of the object element
+
+