// JavaScript Document

function showPopUp()
{
	var first = document.getElementById("grey");
	var second = document.getElementById("wrapper");
	var third = document.getElementById("window");
	first.style.display = "block";
	second.style.display = "block";
	third.style.display = "block";
}

function hidePopUp()
{
	var first = document.getElementById("grey");
	var second = document.getElementById("wrapper");
	var third = document.getElementById("window");
	first.style.display = "none";
	second.style.display = "none";
	third.style.display = "none";
}



<!-- Pop Up
var win = null;
function newWindow(mypage,myname,w,h,features) {
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  if (winl < 0) winl = 0;
  if (wint < 0) wint = 0;
  var settings = 'height=' + h + ',';
  settings += 'width=' + w + ',';
  settings += 'top=' + wint + ',';
  settings += 'left=' + winl + ',';
  settings += features;
  win = window.open(mypage,myname,settings);
  win.window.focus();
}
//  End -->