function change_ex() {
changing = document.getElementById('box');
path=changing.getAttribute('href');
lenght=path.length;
startfrom = lenght - 12;
path=path.substr(startfrom,12);
if(path=="images/1.jpg") {
changing.src='images/2.jpg';
}
else {
changing.src='images/1.jpg';
}
}
function change(changing) {
paths='images/door_';
pathe='.jpg';
//img=getElementById('dver');
now=paths + changing + pathe;
img = document.getElementById('dver');
img.src=now;