How to send a javascript associative array by Ajax

Hi.

I have an associative array (an object with properties, implemented by an array object) which I would like to send by AJAX using jquery.

I have this sniped of code:

	var params = {
			'assoc_array': assoc_array,
			'another_param': 'blah blah',
		 };

	$.ajax({
		url: "my_url.php",
		data: params,
		type: 'post',
      });

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the array is declared and filled this way:

var assoc_array = new Array(); 

function add_element(name,value){
   assoc_array[name]=value;
}

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I can see on firebug that only the other parameter is send by post, but not the assoc_array parameter. Why?

Thanks.