Use java to download a plugin

i'm trying to make a 3d interactive web application, the problem here is that it uses scol voyager plugin to work and i believe i may lose some users thinking it's some sort of virus or simply not willing to download the plugin, so by searching in scolring forum i saw a thread with a similar problem and a possible solution

• Use flash or java (which are plugins too, but installed on most of computers) as a "wrapper" that will download your plugin (your 3D engine if you prefer) without asking anything. The second seems better, as the user does not do anything... but, it installs software on the user pc without warning him

so i was wondering how can i do that ?

I want to use some sort of java code that will make the navigator of the user of my website download the plugin(and install it).