I'm using Javascript to find if something is in an array or not, but when I'm using this code it doesn't alert anything at all, which means it's not working correctly. What am I doing wrong?

```
var theArray = new Array("one","two","three");

if (theArray.indexOf("one")) { alert("Found it!"); }
if (!theArray.indexOf("four")) { alert("Did not find it!"); }

```