Passing variables with POST to another page with Jquery

$.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        url: "LinkTagOut.aspx",
        dataType: "json",
        data: { id: 1 }, // or the string: 'id=1'
        complete:
        function () {
            window.location = "LinkTagOut.aspx";
        }

});

From the $.ajax documentation (data option):

Data to be sent to the server. It is converted to a query string, if not already a string. It's appended to the url for GET-requests. See processData option to prevent this automatic processing. Object must be Key/Value pairs. If value is an Array, jQuery serializes multiple values with same key based on the value of the traditional setting (described below).

Also, make sure to return false from the end of the submit handler (or whatever fires the ajax call) to ensure that a 'normal' redirect is not happening.

This answer is just for a quick fix

why don't you just pass as query string here

window.location = "LinkTagOut.aspx?variabletopass=test"; 

<form id="target" action="destination.html">
  <input type="text" value="Hello there" />
  <input type="submit" value="Go" />
</form>
<div id="other">
  Trigger the handler
</div>

$('#target').submit(function() {
$.post('ajax/test.html', function(data) {      
});
  return false;
});