JavaScript: Add item to BEGINNING of object (NOT ARRAY)

How can I add an item to the beginning of an object?  This adds it to the end:
var obj = {"O":"-","R":"-","L":"-","D":"-"};
obj.W="-";
alert(JSON.stringify(obj));

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I was advised to use unshift() however that seems to only work with arrays.  This must stay an object, and the desired order must be maintained.
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hankknightAsked:
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leakim971Connect With a Mentor PluritechnicianCommented:
Test page : http://jsfiddle.net/KpA8v/2/

var obj = {"O":"-","R":"-","L":"-","D":"-"};// YOUR LINE

var bck = obj;
obj = {};

obj.W="-";// YOUR LINE


for(var i in bck) obj[i] = bck[i];

alert(JSON.stringify(obj));// YOUR LINE

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