[SOLVED] simple object question

[valtido]

is there anyway to do this on javascript ?

 

function foo(id){

    this.id = id;

}

var nVar = new foo('hello');

instead of

alert(foo.id)

 

i need to do this

var world ='id';

alert(foo.{world})

 

 

[valtido]

never mind found it

 

for anyone who needs it its

 

alert(foo[world])