function ShowPopup() {


 var viewportwidth;
 var viewportheight;

 
 if (typeof window.innerWidth != 'undefined')
 {
      viewportwidth = window.innerWidth;
      viewportheight = window.innerHeight;
 }
 

 else if (typeof document.documentElement != 'undefined'
     && typeof document.documentElement.clientWidth !=
     'undefined' && document.documentElement.clientWidth != 0)
 {
       viewportwidth = document.documentElement.clientWidth;
       viewportheight = document.documentElement.clientHeight;
}
 
 
 else
 {
       viewportwidth = document.getElementsByTagName('body')[0].clientWidth;
       viewportheight = document.getElementsByTagName('body')[0].clientHeight;
 }
	 pw=(viewportwidth/2)-200;
	 ph=(viewportheight/2)-200;
	document.getElementById('start_popup').style.left = pw+'px';
	document.getElementById('start_popup').style.top = 0+'px';
	document.getElementById('start_popup').style.display = '';
}

function close_popup() {
	document.getElementById('start_popup').style.display = 'none';

}