window.onload = externalLinks;

function externalLinks() {
	if(!document.getElementsByTagName) return;

	var links,a,i;

	links = document.getElementsByTagName("a");

	for(i=0;i<links.length;i++) {
		a = links[i];

		if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("external") > -1) {
			a.onclick = function() {
				window.open(this.href);
				return false;
			}
		}
	}
}