Just set the HTML-attribute again for the textfield-plugin, just like Sacha said! This can be done by an action, mouseover, mouseclick etc....
onclick,set(plugin[whatever].html,......
Sometimes the plugin wont get the new html-attribute setting it directly if using HTML5. If this happens, write the full html-attribute first into a variable txtadd(blabla,'data:','your_text',get(or_path_to_variable_containing_the_text));
and then set the plugins html-tag
set(plugin[whatever].html,get(blabla));
Best regards
Nupsi