function external_links() {
	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 = external_links;

function change_style(sheet, url) {
	sheet = sheet-1;
	if(document.styleSheets) {
		var c = document.styleSheets.length;
		for(var i = 0; i < c; i++) {
			if(i != sheet)
				document.styleSheets[i].disabled = true;
			else {
				document.styleSheets[i].disabled = false;
				location.href = url + "?style=" + (i+1);
			}
		}
		
	}
}