Jquery detect orientation change

Detect a orientation change of portable device with jQuery:

function orient() {
var mobh1 = jQuery(window).height(); 
var mobw1 = jQuery(window).width(); 
if(mobh1 > mobw1) {
             pos = 1;
        } else {
             pos = 2;
        }
}

jQuery(document).ready(function () {
mobmenu();
orient();
pos1 = pos ;
});

jQuery(window).resize(function () {
orient();
if(pos1 == pos) {
  /* some logic if orientation is the same */           
} else {
  /* some logic if orientation is changed */
pos1 = pos ;
 }
});