You can also use indexValue attribute for passing multiple parameters via object:
var someData = "hello";
jQuery.ajax({
url: "http://maps.google.com/maps/api/js?v=3",
indexValue: {param1:someData, param2:"Other data 2", param3: "Other data 3"},
dataType: "script"
}).done(function() {
console.log(this.indexValue.param1);
console.log(this.indexValue.param2);
console.log(this.indexValue.param3);
});