/*
 *
 * You need to put the name and values in quotes when you call the function, like this:
 * set_cookie( 'mycookie', 'visited 9 times', 30, '/', '', '' );. Don't forget to put in empty quotes for the unused parameters or
 * you'll get an error when you run the code. This makes the cookie named 'mycookie', with the value of 'visited 9 times', and with 
 * a life of 30 days, and the cookie is set to your root folder.
 *
 * The Set_Cookie values for 'domain' and 'secure' are not utilized. Use 'domain' on the Javascript cookie if you are using it on a 
 * subdomain, like widgets.yoursite.com, where the cookie is set on the widgets subdomain, but you need it to be accessible over the
 * whole yoursite.com domain.
 *
 * It's good practice to not assume the path to the site root will be set the way you want it by default, so do this manually as a 
 * rule, '/'. If no value is set for expires, it will only last as long as the current session of the visitor, and will be automatically 
 * deleted when they close their browser. 
 */


function set_cookie(name, value, expires, path, domain, secure) 
{
	// set time, it's in milliseconds
	var today = new Date();
	today.setTime( today.getTime() );
	/*
	if the expires variable is set, make the correct 
	expires time, the current script below will set 
	it for x number of days, to make it for hours, 
	delete * 24, for minutes, delete * 60 * 24
	*/
	if ( expires )
	{
	expires = expires * 1000 * 60 * 60 * 24;
	}
	var expires_date = new Date( today.getTime() + (expires) );
	
	document.cookie = name + "=" +escape( value ) +
	( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + 
	( ( path ) ? ";path=" + path : "" ) + 
	( ( domain ) ? ";domain=" + domain : "" ) +
	( ( secure ) ? ";secure" : "" );
}

/*
 * This will retrieve the cookie by name, if the cookie does not exist, it will return false, so you can do things like 
 * if ( Get_Cookie( 'your_cookie' ) ) do something.
 */

function get_cookie(name) {
	var start = document.cookie.indexOf(name + "=");
	var len = start + name.length + 1;
	if ((!start) && (name != document.cookie.substring(0, name.length )))
	{
		return null;
	}
	if (start == -1) return null;
	var end = document.cookie.indexOf(";", len);
	if (end == -1) end = document.cookie.length;
	return unescape(document.cookie.substring(len, end)); //中文时有乱码
	//return decodeURI(document.cookie.substring(len,end));   
}

function get_cookieCn(name) {
	var start = document.cookie.indexOf(name + "=");
	var len = start + name.length + 1;
	if ((!start) && (name != document.cookie.substring(0, name.length )))
	{
		return null;
	}
	if (start == -1) return null;
	var end = document.cookie.indexOf(";", len);
	if (end == -1) end = document.cookie.length;
	//return unescape(document.cookie.substring(len, end)); //中文时有乱码
	return decodeURI(document.cookie.substring(len,end));   
}

/*
 * Here all you need to do is put in: Delete_Cookie('cookie name', '/', '') and the cookie will be deleted. Remember to match 
 * the cookie name, path, and domain to what you have it in Set_Cookie exactly, or you may get some very hard to diagnose errors.
 */

// this deletes the cookie when called
function Delete_Cookie(name, path, domain) {
	if(Get_Cookie(name)) document.cookie = name + "=" + ((path) ? ";path=" + path : "") + ((domain) ? ";domain=" + domain : "" ) + ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}

/*
 * SAMPLE CODE
 *
 * <script type="text/javascript">
 * // remember, these are the possible parameters for Set_Cookie:
 * // name, value, expires, path, domain, secure
 * Set_Cookie( 'test', 'it works', '', '/', '', '' );
 * if ( Get_Cookie( 'test' ) ) alert( Get_Cookie('test'));
 * // and these are the parameters for Delete_Cookie:
 * // name, path, domain
 * // make sure you use the same parameters in Set and Delete Cookie.
 * Delete_Cookie('test', '/', '');
 * ( Get_Cookie( 'test' ) ) ? alert( Get_Cookie('test')) : 
 * alert( 'it is gone');
 * </script>
 */