php - How is the iFrame with Header Preview Achieved? -

i know general question, can't true answer on stackoverflow or searching google. how make page fixed header logo , links , iframe of given url. closest i've come across iframe fixed header. want achieve this example on codecanyon. first link gives decent answer, page has 2 scroll bars. in advance!

edit: want make iframe stretch height of page :)

the examples linked using jquery dynamically adjust height.

//function adjust height of iframe var calcheight = function () {     var headerdimensions = $('#header-bar').outerheight(true);     $('#preview-frame').height($(window).height() - headerdimensions); }  $(document).ready(function () {     calcheight(); });  $(window).resize(function () {     calcheight(); }).load(function () {     calcheight(); }); 

this code used dynamically adjust height.

you can see here in jsfiddle http://jsfiddle.net/qqkc4/11/