Java Script - Read address

[Re-G]

Hi all.

I have 2 question about how to write a script in Custom JavaScript.

1. How to read a value of specific address (KNX, virtual address) and depends on value do something. I don't mean set a custom css class to object, just read directly value and then do smoothing. for example change a css class of completely different object.
   
2. It is possible to set a custom css class to object 1 .css1 then read another object 2 .css2 value and then change some of parameters (depends on value of object 2) of object 1
   

Thank You in advance for answer.