jquery change picture source
// https://codepen.io/kman/pen/dXjpoX
// Stockphotos JS
$(document).ready(function(){
var flag = 0;
$("button#changeSize").click(function(){
if(flag == 0) {
$("#dummyimage").attr("src","http://dummyimage.com/350x155/");
flag = 1;
}
else if(flag == 1) {
$("#dummyimage").attr("src","http://dummyimage.com/450x255/");
flag = 0;
}
});
});