Checking a Drop Down Value against a Javascript Numeric Array List

I would like to check an drop down list value on a form page with a numeric list to see if the value is in the list.
How can this be done via Javascript?

For example:
 
var myList = new Array(2,3,14,25); // the id list to check against

var fieldVal = thing[thing.selectedIndex].value; // the numeric selected drop down field value


if(fieldVal == myList[idx])
    alert("Yes the drop down value is in my array list");
else
    alert("No. the drop down value is not in the array list");