function backgroundFilter()
{
	var div;
	div = document.getElementById('backgroundFilter');   
	div.style.height = document.body.clientHeight + "px";
	div.style.width = document.documentElement.offsetWidth + "px";
	if(div.style.display==''&&div.offsetWidth!=undefined&&div.offsetHeight!=undefined)
	{
		div.style.display = (div.offsetWidth!=0&&div.offsetHeight!=0)?'block':'none'; 
	}
	div.style.display = (div.style.display==''||div.style.display=='block')?'none':'block';
}
function popUp()
{
	var div;
	div = document.getElementById('popupWindow'); 
	if(div.style.display==''&&div.offsetWidth!=undefined&&div.offsetHeight!=undefined)
	{
		div.style.display = (div.offsetWidth!=0&&div.offsetHeight!=0)?'block':'none'; 
	}
	div.style.display = (div.style.display==''||div.style.display=='block')?'none':'block';
	div.style.left = (document.documentElement.clientWidth - div.clientWidth)/2 + 'px';
	div.style.top = document.documentElement.scrollTop + div.clientHeight +'px';
}
function SetCookie(name,value)
{
    var date = new Date();
	date.setTime(date.getTime()+(12*60*60*1000));
	var expires = "; expires="+date.toGMTString();
	document.cookie = name + "=" + escape(value) + expires;
}
function GetCookie(name)
{
	var result = null;
	var myCookie = document.cookie + ";";
	var searchName = name + "=";
	var startOfCookie = myCookie.indexOf(searchName);
	var endOfCookie;
	if (startOfCookie != -1)
	{
	startOfCookie += searchName.length;
	endOfCookie = myCookie.indexOf(";",startOfCookie);
	result = unescape(myCookie.substring(startOfCookie, endOfCookie));
	}
	return result;
}		 
function startPopup()
{
	var showTimes = GetCookie("showTimes");
	if(showTimes == null)
	{
		backgroundFilter();	popUp();
	    SetCookie("showTimes",1);
	}
}