function replaceImg (object) {
	var obsrc = object.src + "";
	var ext = obsrc.substring(obsrc.lastIndexOf(".") + 1);
	object.src = obsrc.substring(0, obsrc.length - (ext.length + 1)) + "rol." + ext;
	object.style.cursor = "pointer";
}
function placeBackImg (object) {
	var obsrc = object.src + "";
	var ext = obsrc.substring(obsrc.lastIndexOf(".") + 1);
	object.src = obsrc.substring(0, obsrc.length - (ext.length + 4)) + "." + ext;
	object.style.cursor = "auto";
}
function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") anchor.target = "_blank";
	}
}
window.onload = externalLinks;