How to invoke an iMacro from JavaScript?

The answer is this.

iimPlay("Test.iim")

When calling a macro inside a Macros folder put "" around the macro and it will play it. Also you can add timer for that macro like this.

iimPlay("Test.iim",60)

This means the macro has maximum 60 seconds to complete.
When playing the macro which is declared as variable inside the .js file then you do it like this

var test;

test ="CODE:";
test +="SET !ERRORIGNORE YES "+"\n";
test +="URL GOTO=www.google.com "+"\n";


iimPlay(test,60)

And that is all.