JavaScript: Convert String as Parameter to Array Name?

is it possible to convert Function Parameter string to Array name?

function SwitchElement(type){

    var cur = type.indexOf(document.getElementById(type).src);
    console.log(cur);
    if(cur < eyes.length-1){

    }
}

So that "type" is Addressed as array name.

If so, how? I am trying to do it just like that function but it returns me index -1

Note: Div of element and Arrayname share same name.