[jQuery] Translate to jquery

[Sebastián V. Würtz]

I what translate this (im still noob) to jquery can anyone helpme?
function insertAfter(newElement,targetElement) {
 var parent = targetElement.parentNode;
 if (parent.lastChild == targetElement) {
   parent.appendChild(newElement);
 } else {
   parent.insertBefore(newElement,targetElement.nextSibling);
 }
}
function captionizeImages() {
 if (!document.getElementsByTagName) return false;
 if (!document.createElement) return false;
 var images = document.getElementsByTagName("img");
 if (images.length < 1) return false;
 for (var i=0; i<images.length; i++) {
   if (images[i].className.indexOf("captioned") != -1) {
     var title = images[i].getAttribute("title");
     var divCaption = document.createElement("div");
     divCaption.className = "caption";
     var divCaption_text = document.createTextNode(title);
     divCaption.appendChild(divCaption_text);
     var divContainer = document.createElement("div");
     divContainer.className="imgcontainer";
     images[i].parentNode.insertBefore(divContainer,images[i]);
     divContainer.appendChild(images[i]);
     insertAfter(divCaption,images[i]);
   }
 }
}