sorry that video was corrupted this the right one
https://drive.google.com/file/d/0B83iEH2VRWC8Y2htTy1GaTdwRTA/view?usp=sharing

please go here enfold/js/avia.js
i ve edited the code below, you will find my code signed by //rayan 17/3/2015
//check if the browser supports element rotation
function avia_header_size()
{
var win = $(window),
header = $(‘.html_header_top.html_header_sticky #header’);

if(!header.length) return;

var logo = $(‘#header_main .container .logo img, #header_main .container .logo a’),
elements = $(‘#header_main .container:first, #header_main .main_menu ul:first-child > li > a:not(.avia_mega_div a, #header_main_alternate a)’),
el_height = $(elements).filter(‘:first’).height(),
isMobile = $.avia_utilities.isMobile,
scroll_top = $(‘#scroll-top-link’),
transparent = header.is(‘.av_header_transparency’),
shrinking = header.is(‘.av_header_shrinking’),
set_height = function()
{
var st = win.scrollTop(), newH = 0;
var mynewH = 0;//rayan edit 17/3/2015

if(shrinking && !isMobile)
{
if(st < el_height/2)
{

newH = el_height – st;
mynewH = 0;//rayan edit 17/3/2015
av_change_class(header, ‘remove’, ‘header-scrolled’);
//header.removeClass(‘header-scrolled’);
}

else
{
newH = el_height/2;
mynewH =el_height-newH -10 //rayan edit 17/3/2015
//header.addClass(‘header-scrolled’);
av_change_class(header, ‘add’, ‘header-scrolled’);
}

elements.css({‘height’: newH + ‘px’, ‘lineHeight’: newH-mynewH + ‘px’});//rayan edit 17/3/2015
logo.css({‘maxHeight’: newH + ‘px’});
}

if(transparent)
{
if(st > 50)
{
//header.removeClass(‘av_header_transparency’);
av_change_class(header, ‘remove’, ‘av_header_transparency’);
}
else
{
//header.addClass(‘av_header_transparency’);
av_change_class(header, ‘add’, ‘av_header_transparency’);
}
}

}

if($(‘body’).is(‘.avia_deactivate_menu_resize’)) shrinking = false;

if(!transparent && !shrinking) return;

win.on( ‘debouncedresize’, function(){ el_height = $(elements).attr(‘style’,””).filter(‘:first’).height(); set_height(); } );
win.on( ‘scroll’, function(){ window.requestAnimationFrame( set_height )} );
set_height();
}

i’m using Win7 and Chrome browser.
if you wanna see the problem just click one small click on the scroll bar.

Hi!
it works nice :)
thx alot for the help
but what the + means ?

Hello Yigit
that’s really magic !!!
awesome please could you tell me how you figure it out ?