You can send a map containing data needed to customize contents of the called fragment page as you pass those directly in the querystring.

For example as you pass data in a querystring ("http://myURL.php?data1=bar&data2=foo"), you can pass data to an ajax call as follow:

var dataToPass={data1:bar, data2:foo, ...}
$.ajax({
  url:"http://myURL.php",
  data:dataToPass,
  type:"html",
  success:function(){}
})

Than, it's part of the logic of your page how to get this parameters from the other side...