function changeLang()
{
    pathName = window.location.pathname;
    pathNameLength = pathName.length;
    if(pathNameLength > 2 && pathNameLength < 4 ){
        pathName = (pathName == '/ar')? '/en':'/ar';
    }else{
        _pathName = pathName.replace('/en/','/ar/');
        pathName = (_pathName == pathName) ? pathName.replace('/ar/','/en/'):_pathName;
    }
    
    wl = window.location;
    url = wl.protocol+'//'+wl.hostname+pathName;
	window.location = url;
}