/* addRemoveEvent
********************/
function addRemoveEvent(add, el, evt, func){
	if(add){
		if(el.addEventListener) el.addEventListener(evt, func, false);
		else if (el.attachEvent) el.attachEvent("on" + evt, func);
	}else{
		if(el.removeEventListener) el.removeEventListener(evt, func, false);
		else if (el.detachEvent) el.detachEvent("on" + evt, func);
	}
}
/* anchors
********************/
function initAnchors(){
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; ++i){
		if (!anchors[i].getAttribute("href") || !anchors[i].getAttribute("rel")) continue;
		var relation = String(anchors[i].getAttribute("rel"));
		if (relation.match("popup")) anchors[i].onclick=popup;
		if (relation == "external") anchors[i].onclick=externalLink;
	}
}
function popup(){
	var relation = String(this.getAttribute("rel"));
	if(relation == "popup"){
		window.open(this, "pop", "scrollbars=no");
	}else{
		var arguments = relation.substring(6,relation.length-1).split(";");
		window.open(this,arguments[0],'toolbar=0,location=0,directories=0,status=0,menubar=0,' + arguments[1] + ',resizable=no,width=' + arguments[2] + ',height=' + arguments[3] + ',top=' + arguments[4] + ',left=' + arguments[5]);
	}
	return false;
}
function externalLink(){
	window.open(this);
	return false;
}