var checkSignInOnload   = function() 
{
    var XMLhttp = getAjaxCore();
    
    
    // sending information
    var url = 'Ajax_script/signin.ajax.php?tmp={random}';
    url     = url.replace('{random}', Math.random());
    
    // onreadystatechange
    XMLhttp.onreadystatechange  = function()
    {
        if(XMLhttp.readyState   == 4) {
            var response    = XMLhttp.responseText;
            
            if(response != 'false') {
            
                document.getElementById('_taotaikhoan').innerHTML   = '';
                document.getElementById('sign').innerHTML           = response;
                
                showTAB('n');
				
				document.getElementById('ajax_loading').style.display  = 'none';
				document.getElementById('ajax_loading').style.width    = '600px';
            
            }
            
            
        }
    }
    
    
    
    XMLhttp.open('GET', url, true);
    
    XMLhttp.send(null);
    
    
}