modal multiple images
var modal = document.getElementById("myModal");
var i;
var img = document.getElementsByClassName("myImg");
var modalImg = document.getElementById("img01");
for(i=0;i< img.length;i++)
{
img[i].onclick = function(){
modal.style.display = "block";
modalImg.src = this.src;
}
}
var span = document.getElementsByClassName("close")[0];
span.onclick = function() {
modal.style.display = "none";
}