Detect devices orientation

device_orientation.js

detectOrientation();
window.onorientationchange = detectOrientation;
function detectOrientation(){
    if(typeof window.onorientationchange != 'undefined'){
        if ( orientation == 0 ) {
             //Do Something In Portrait Mode
        }
        else if ( orientation == 90 ) {
             //Do Something In Landscape Mode
        }
        else if ( orientation == -90 ) {
             //Do Something In Landscape Mode
        }
        else if ( orientation == 180 ) {
             //Do Something In Landscape Mode
        }
    }
}