function view1(){
document.getElementById('img2').style.display="none";
document.getElementById('img1').style.display="block";
}
function close1(){
document.getElementById('img1').style.display="none";
document.getElementById('img2').style.display="none";

}
function view2(){
document.getElementById('img1').style.display="none";
document.getElementById('img2').style.display="block";
}
function close2(){
document.getElementById('img2').style.display="none";
document.getElementById('img1').style.display="none";

}