Thanks Chris. That's what I was looking for. However, note that the method is serialize(). And there is another method serializeArray() that looks very useful that I may use. Thanks for pointing me in the right direction.
var queryString = $('#frmAdvancedSearch').serialize();
alert(queryString);
var fieldValuePairs = $('#frmAdvancedSearch').serializeArray();
$.each(fieldValuePairs, function(index, fieldValuePair) {
alert("Item " + index + " is [" + fieldValuePair.name + "," + fieldValuePair.value + "]");
});