function getCookie(cookieName)
{
	if (document.cookie.length > 0) 
	{ 
		begin = document.cookie.indexOf(cookieName+"="); 
		if (begin != -1)
		{ 
			begin += cookieName.length+1; 
			end = document.cookie.indexOf(";", begin);
			if (end == -1)
			{
				end = document.cookie.length;
			}
			return unescape(document.cookie.substring(begin, end)); 
		} 
	}
	return null;
} 

function setCookie(cookieName, cookieValue, expiredays) 
{  
	var ExpireDate = new Date ();
	ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));
	document.cookie = cookieName + "=" + escape(cookieValue) + 
	((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString()) +
	"; path=/";
}
 
function delCookie (cookieName) 
{  
	if (getCookie(cookieName)) 
	{
		document.cookie = cookieName + "=" +
		"; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}

function popupWindow(mypage, myname, w, h, scroll)
{
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
	win = window.open(mypage, myname, winprops)
	
	if (parseInt(navigator.appVersion) >= 4) 
	{ 
		win.window.focus(); 
	}
}