Positioning of jquery.simplemodal popup -

i using jquery.simplemodal plugin , need regarding postion of modal. i've different modals opening @ different position of page i.e. @ top, middle or bottom. want position of modal per position linked i.e. bottom, top or middle. right now, it's 22% top , if click @ bottom, opens page @ top leaving 22% margin @ top.

jquery(function ($) { $('#confirm-dialog input.confirm, #confirm-dialog a.confirm').click(function (e) {           confirm("");                 });  });    function confirm(message, callback) {     $('#confirm').modal({         closehtml: "",         position: ["22%",],         overlayid: 'confirm-overlay',         containerid: 'confirm-container',         onshow: function (dialog) {             var modal = this;                            }            });  } 

try set modal position fixed. more i'd need see html, maybe can make jsfiddle