Js variables & Lua variables

[Jonathan]

Hello !

I am actually able to put a lua value into a js variable using a piece of code that i found on this forum :

var js_variable = '<? write(lua_variable) ?>'

If someone could explain to me what is this write function ... and why don't we need the ';' here ?


Also, i would like to do the opposite but when i try something like :

'<? lua_variable ?>' = js_variable;

That does not work... 
Thx for help !