// - init-hidden : start hidden rather than visible
//
// methods are as follows
// (*) trigger_html (): return the html code for the trigger
// (*) image_html (): returns the html code for the image
// - init-hidden : start hidden rather than visible
//
// methods are as follows
// (*) trigger_html (): return the html code for the trigger
// (*) image_html (): returns the html code for the image