function login(){
  w=(document.body.clientWidth/2)-150
  document.getElementById('login').style.left=w+'px'
  h=(document.body.clientHeight)-300
  document.getElementById('login').style.top=h+'px'
  document.getElementById('login').style.visibility='visible'
  }
  function loginClose(){
  document.getElementById('login').style.visibility='hidden'
  document.getElementById('login').style.left="0px";
  document.getElementById('login').style.top="200px";
  }// JavaScript Document