function external_link(){
	var host_Name = location.host;
	var host_Check;
	var link_Href;

	for(var i=0; i < document.links.length; ++i)
	{
		link_Href = document.links[i].host;
		host_Check = link_Href.indexOf(host_Name,0);

		if(host_Check == -1){
			document.links[i].target = "_blank";
			document.links[i].title = "[外部リンク]";
		}

	}
}
window.onload = external_link;