Post Example with ContentType?

Post Example with ContentType?

i think there's something wrong with this code. Instructions for the API say to 
set the Content-Type header of your request to application/x-www-form-urlencoded
but i don't think i'm doing it correctly.  
      $.post( 
	"../api.php?action=edit&title=Portal:TagDescriptions&section=2&summary=Hello%20World",
	{ Text: "Hello, world.",
          token:"c30460d9159a5e2eccca60944ef286405b2393d1%2B%5C%5C" },
	function(data) {
   		$('#lblDescription').html(data);
	},
        "application/x-www-form-urlencoded"
      );