Javascript/window.open()

function winOpen(){
  window.open("http://arise.work");
}
	

function winOpen2(url){
  window.open(url,"","width=640,height=480,top=0,left=0");
}
	

function winCenter(){
 //別窓の左と上の余白を求める
  var w = ( screen.width-640 ) / 2;
  var h = ( screen.height-480 ) / 2;
  //オプションパラメーターleftとtopに余白の値を指定
  window.open("http://www.google.co.jp","","width=640,height=480"
              +",left="+w+",top="+h);
}