// JavaScript Document
// 说明：用 Javascript 操作 Cookie 
// 整理：http://www.CodeBit.cn  
function getCookie( 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 '';
     var end = document.cookie.indexOf( ';', len );
     if ( end == -1 ) end = document.cookie.length;
     return unescape( document.cookie.substring( len, end ) );
 }
function setCookie( name, value, expires, path, domain, secure ) {
     var today = new Date();
     today.setTime( today.getTime() );
     if ( expires ) {
         expires = expires * 86400;
     }
     var expires_date = new Date( today.getTime() + (expires) );
     document.cookie = name+'='+escape( value ) +
     ( ( expires ) ? ';expires='+expires_date.toGMTString() : '' ) + //expires.toGMTString()         
     ( ( path ) ? ';path=' + path : '' ) +         
     ( ( domain ) ? ';domain=' + domain : '' ) +         
     ( ( secure ) ? ';secure' : '' );
 }
function deleteCookie( name, path, domain ) {
     if ( getCookie( name ) ) {
		 document.cookie = name + '=' +  ( ( path ) ? ';path=' + path : '') +  ( ( domain ) ? ';domain=' + domain : '' ) + ';expires=Thu, 01-Jan-1970 00:00:01 GMT';
	 }
 }