//返回cookie
function GetCookie(name) {
	var cookies = document.cookie.split( ';' );
	var cookie = '';
	for(var i=0; i<cookies.length; i++) {
		cookie = cookies[i].split('=');
		if(cookie[0].replace(/^\s+|\s+$/g, '') == name) {
			if(cookie[0].replace(/^\s+|\s+$/g, '') == "PreviousPage"){
				return decodeURIComponent(cookies[i].substring(cookies[i].indexOf("=")+1));
			}
			else{
				return (cookie.length <= 1) ? "" : decodeURIComponent(cookie[1]);
			}
		}
	}
	return null;
}

function readCookie()
{
	/*
	alert( GetCookie( "country" ) );
	var expires = new Date();

	SetCookie( "country", "usa", 60 );
	alert( GetCookie( "country" ) );
	*/
}

function SetCookie( name, value )
{
	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 + "=" + encodeURIComponent(value)
	+((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
	+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
	+((secure == true) ? "; secure" : "");
}

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