function setSpanTag() {
for (var i = 0; i < document.getElementsByTagName("img").length; i++) {
var myElement = document.getElementsByTagName("img")[i];
			
var newSpan = document.createElement("span");
newSpan.innerHTML = "&nbsp";
			
var myElternElement = myElement.parentNode;
myElternElement.insertBefore(newSpan, myElternElement.firstChild);
}
}
window.onload = setSpanTag;