var Newwin = function(){

	this.blank = function(){
		if(!document.getElementsByTagName){
			return;
		}

		var cnt;
		var anchors	= document.getElementsByTagName("a");
		var anchor;

		cnt = anchors.length;
		for(var y = 0; y < cnt; y++){
			anchor = anchors[y];
			if(
			anchor.getAttribute("href")&&
			!anchor.getAttribute("target")&&
			anchor.getAttribute("href",2).indexOf("sigyo.net/",0) == -1) {
				anchor.target = "_blank";
			}
		}
	}
}


var nwin = new Newwin().blank;
if (window.addEventListener) { //for W3C DOM
  window.addEventListener("load", nwin, false);
} else if (window.attachEvent) { //for IE
  window.attachEvent("onload", nwin);
} else  {
  window.onload = nwin;
}