function toggle_visibility(id) {
	
		// set expiry date for cookie - 1 year from now
		var now = new Date();
		now.setTime(now.getTime() + 1000 * 60 * 60 * 24 * 365)
	
       var e = document.getElementById(id);
       
	   if(e.style.display == 'block')
		{
		
			e.style.display = 'none';
			document.cookie= id + "=" + 'none;expires=' + now;
			document.getElementById(id+'btn').src="Images/Icons/"+id+"btn_down.gif";
		}
       else
		{
			e.style.display = 'block';
			document.cookie= id + "=" + 'block;expires=' + now;
			document.getElementById(id+'btn').src="Images/Icons/"+id+"btn_up.gif";
		}
    }
	

	function getCookie(name)

{

	var cookies = document.cookie;

	if (cookies.indexOf(name) != -1)

	{

		var startpos = cookies.indexOf(name)+name.length+1;

		var endpos = cookies.indexOf(";",startpos)-1;

		if (endpos == -2) endpos = cookies.length;

		return unescape(cookies.substring(startpos,endpos));

	}

	else

	{

		return false; // the cookie couldn't be found! it was never set before, or it expired.

	}

}