Abstract: The invention relates to a lens, comprising a container (100) defining a volume (V) which is filled with a transparent liquid (2), wherein the container (10) comprises a transparent and elastically deformable membrane (20) and a rigid member (30), wherein the membrane (20) and the rigid member (30) delimit said volume (V), and a lens shaping element (200) that contacts the membrane (20) and defines an area (21) of said membrane (20), which area (21) has an adjustable curvature for adjusting the focal length of the lens (1). According to the invention, the lens (1) is configured to compensate a thermal expansion of the liquid (2) and/or a change of the refractive index of the liquid (2) due to an increased temperature of the liquid (2) in order to reduce an unwanted thermally induced change of the focal length of the lens (1).

Abstract: A system and method for interactive internet co-browsing comprising an internet web browser (20), an enhancement to that internet web browser in the form of a web browser toolbar (10), web browser pages (90) and web server (72) all connected by an internet connection. The enhancement to the web browser can be made a core feature of a web browser. The co-browsing system provides a way for an individual or multiple individuals to lead an internet web co-browsing session while an individual or multiple individuals follow the internet web co-browsing session. Co-browsing can be done with a low data rate connection since only URL data obtained from the browser document object model is transmitted between leaders and followers. An alternative embodiment makes it possible to co-browse using a variant of the web browser toolbar that writes and reads web browser URL information to and from an instant messenger chat client.