function GetCookieVal(offset)
//获得Cookie解码后的值
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}

function SetCookie(name, value)
//设定Cookie值
{
var expdate = new Date();
var argv = SetCookie.arguments;
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
+((secure == true) ? "; secure" : "");

}

function DelCookie(name)
//删除Cookie
{
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}

function GetCookie(name)
//获得Cookie的原始值
{
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 mcheck(f,id)
{
	if(f)
	{
		var tmp=GetCookie('duibiid');
		tmp=(tmp=="" || tmp==null)?','+id+',':tmp+id+',';
		SetCookie('duibiid',tmp);
	}
	else
	{
		v=','+id+',';
		var tmp=GetCookie('duibiid');
		tmp=tmp.replace(v, ",");
		SetCookie('duibiid',tmp);
	}

	//alert(GetCookie('duibiid'));
}

function bijiao()
{
	var tmp=GetCookie('duibiid');
	if(tmp=="" || tmp==null || tmp==",")
	{
		alert("请选择需要比较的品牌！");
	}
	else
	{
		document.bjform.clist.value=tmp;
		document.bjform.action="/compare.php";
		document.bjform.target="_blank";
		DelCookie('duibiid');
		document.bjform.submit();
	}
}