Question: here is my code:

```
function figureSelector () {
    document.getElementById("rook").onclick = function  () {
        curr = '"rook"';
    };
};

function moveLine(){
    document.getElementById("upButton").onclick = function() { 
            document.getElementById(curr).style.top = document.getElementById(curr).offsetTop - getPix() * 62  + "px"; 
            counter= counter + getPix();
    }; 

```

I want to write an universal function for a chess piece to move. All I want is, when one clicks the chess piece, and then presses the up button, it must go up.

Answer: 
Yes you can use String variable:

**HTML:**

```
<div id="name" style="width:300px;height:300px;background:red"></div>

```

**javascript:**

```
var b = 'name';
document.getElementById(b).innerHTML = 'none';

```

[jsfiddle here](http://jsfiddle.net/s5fJY/)
You can even do stuff like this: 

```
function mark(yy)  {
    for (var ii = 0; ii < 7; ii++ )  {
        if (  ii == yy )  {
            document.getElementById("b"+ii).style.fontWeight = "bold";
         }
...

```

But be careful of your loop limits to be sure you have a matching id. I just spent hours trying to figure out why `("b"+ii)` was getting error and finally realized that the error was being caused by exactly that. duh...