Very few applications are using Vbscript, but lot of old code exsists that use Vbscript. So its not very difficult to run into a situation where values have to be passed from one to the other. First i was thinking of using a hidden text box to pass values between the two... but its much easier. You can call variables from both, meaning variables are not specific to the scripting langauge as both are client side scripting langauges.
See the following code:
<input type='hidden' name='passval'>
<!--no need of hidden text box-->
The situation is very different when values are to be passed between a client side script and a server side script.