$(document).ready(function(){

$("a#twitter").hover(
  function(){
    $("#new_site").css("background-position", "0 -122px");
  },
  function(){
    $("#new_site").css("background-position", "0 0");
  }
);

});

function load_popup(){

	var divWidth = 356;
	var divHeight = 350;

	var box = document.getElementById("popup");
	var scrollingLeft = Math.round((document.documentElement.clientWidth/2)-(box.style.width/2)) - (divWidth / 2);
	var scrollingTop = Math.round((document.documentElement.clientHeight/2)-(box.style.height/2)+document.documentElement.scrollTop) - (divHeight / 2);
	box.style.top = scrollingTop+'px';
	box.style.left = scrollingLeft+'px';
	box.style.display = 'block';
	
}