[рони]

mrmammoth,

var  a1 = {
                param1: "value1",
                param2: "value2",
                param3:[]
            };
            a1["param3"].push({
                "subparam1": "vol1",
                "subparam2": "vol2"

            } );
            a1["param3"].push({
                "subparam1": "vol3",
                "subparam2": "vol4"

            } )
            alert(a1.param3[1]["subparam1"]);