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how do I tell javascript what type of data I'm passing to a function?

I have a function that goes like

Code:

function collapse(div) {

    var currentdiv = document.getElementById(div);

    currentdiv.style.zIndex = 3;

}

and code from the html document calls that function like

Code:

<a onclick="collapse('pictures')">pictures</a>

where pictures is the name of a <div> later on that had the id of pictures. Anyway, how can I tell Javascript that I'm passing a string so that the document.getELementById part will work? For example, the code will work if I write in document.getElementById("pictures");.

javascript is typeless, so a variable holds whatever data of whatever type you stick into it

Change

Code:

document.getElementById(div)

Code:

document.getElementById($div)

Though... need the $div to references the variable created.