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

[CMYK]

I have a function that goes like

function collapse(div) {
var currentdiv = document.getElementById(div);
currentdiv.style.zIndex = 3;
}

and code from the html document calls that function like

<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");.

[id10t]

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

Change

document.getElementById(div)


to


document.getElementById($div)


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