Pure javascript method to wrap content in a div
If your "slide"s are always in slidesContainer you could do this
org_html = document.getElementById("slidesContainer").innerHTML;
new_html = "<div id='slidesInner'>" + org_html + "</div>";
document.getElementById("slidesContainer").innerHTML = new_html;
Like BosWorth99, I also like to manipulate the dom elements directly, this helps maintain all of the node's attributes. However, I wanted to maintain the position of the element in the dom and not just append the end incase there were siblings. Here is what I did.
var wrap = function (toWrap, wrapper) {
wrapper = wrapper || document.createElement('div');
toWrap.parentNode.appendChild(wrapper);
return wrapper.appendChild(toWrap);
};