var current = 1;
var numArticles = 4;

function nextArticle() {
	if (current < numArticles) {
		current++;
		new Effect.Move('article-list', { x: -600, y: 0 });
	} else {
		current = 1;
		new Effect.Move('article-list', { x: 600*(numArticles-1), y: 0 });
	}
}

function prevArticle() {
	if (current > 1) {
		current--;
		new Effect.Move('article-list', { x: 600, y: 0 });
	} else {
		current = numArticles;
		new Effect.Move('article-list', { x: -600*(numArticles-1), y: 0 });
	}
}

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"; 
 } 
}

function pageLoaded() {
	numArticles = document.getElementById('article-list').getElementsByTagName('li').length;
	externalLinks();
}

window.onload = pageLoaded;