Quicktime

Apple's Quicktime, available for Macintosh and Windows, has been a pioneer in VR and still is one of the best performers. Quicktime is distributed at no cost and payment is only required if you want to use editing functions. Unfortunately under Windows Quicktime seems to remind the user of the need to upgrade every time it is started and some Windows users (particularly the majority who does not need Quicktime editing functinality) find it a nuisance. As many Apple products, Quicktime is probably technologically ahead of most other competitors but lacks the installed user base.

Can anybody post here a javascript to find out if Quicktime is installed on the client?