<script type="text/javascript">
var arr = new Object();

function testIt() {
	for (var i in arr) {
		alert('arr[\''+i+'\'] is ' + arr[i])
	}
}
</script>

If you click <a href="#" onClick="arr.item='Item Name'; arr.price='4.95';testIt(); return false;">this link</a> this script is executed:</p>