function GetCookie (name) { 
	var arg = name + "="; 
	var alen = arg.length; 
	var clen = document.cookie.length; 
	var i = 0; 
	while (i < clen) { 
		var j = i + alen; 
		if (document.cookie.substring(i, j) == arg) 
			return getCookieVal (j); 
		i = document.cookie.indexOf(" ", i) + 1; 
		if (i == 0) break; 
	} 
	return null;
}

function SetCookie (name, value, expires, path, domain, secure) { 
var argv = SetCookie.arguments; 
var argc = SetCookie.arguments.length; 
var expires = (argc > 2) ? argv[2] : null; 
var path = "/"; 
var domain = "sina.com.hk"; 
var secure = (argc > 5) ? argv[5] : false; 
document.cookie = name + "=" + escape (value) + 
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
((path == null) ? "" : ("; path=" + path)) + 
((domain == null) ? "" : ("; domain=" + domain)) + 
((secure == true) ? "; secure" : "");
}

function DeleteCookie (name) { 
var exp = new Date(); 
exp.setTime (exp.getTime() - 1); 
// This cookie is history 
var cval = 0; 
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

var dToday = new Date();
var exp = new Date(dToday.getYear(),dToday.getMonth(),dToday.getDate(), 23 , 59 , 59 );

var expDays = 1;
var Freq=4;
exp.setTime(exp.getTime() + (expDays*Freq*60*60*1000));


function amt3(count,count_str){
var count = GetCookie('video_ad')
if(count == null) {
SetCookie('video_ad','2', exp, '/', 'sina.com.hk', '')
return 1
}
else{
var newcount = parseInt(count) + 1;
if(newcount<2) count=1;
SetCookie('video_ad',newcount,exp, '/', 'sina.com.hk', '');
return count
}
}

function getCookieVal(offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}