function displayCitations() {
	var quotes = document.getElementsByTagName("blockquote");

	for (var i=0; i<quotes.length; i++) 
	{
	// if there is no cite attribute, continue the loop
	if (!quotes[i].getAttribute("cite")) continue;
	// store the cite attribute
    var url = quotes[i].getAttribute("cite");
	// get all the element nodes in the blockquote
    var quoteChildren = quotes[i].getElementsByTagName('*'); //does not work in IE5.x
	// if there are no element nodes, continue the loop
    if (quoteChildren.length < 1) continue;
	// get the last element node in the blockquote
    var elem = quoteChildren[quoteChildren.length - 1];
	// create the markup
    var link = document.createElement("a");
    var link_text = document.createTextNode("Source");
    link.appendChild(link_text);
    link.setAttribute("href",url);
    var superscript = document.createElement("sup");
    superscript.appendChild(link);
	// add the markup to the last element node in the blockquote
    elem.appendChild(superscript);
	}
}
window.onload = displayCitations