//This function for create XMLHttpRequest object
function createRequestObject()
{
   if (window.XMLHttpRequest) 
   {
      try 
      {
           // Mozilla, Safari, ...
           return new XMLHttpRequest();
       } 
       catch (e){}
   } 
   else 
       if (window.ActiveXObject) 
       {
          try 
          {
              //old IE
              return new ActiveXObject('Msxml2.XMLHTTP');
          } 
          catch (e){}
          try 
          {
               //IE
               return new ActiveXObject('Microsoft.XMLHTTP');
          } 
          catch (e){}
       }
    return null;
}
////////////////////////////////////////////////////////
                        
function sender(url)
{
   //[ 1 ]
   var http_request = createRequestObject();
   if(http_request == null)
   {
       alert('');
       return false;
   }
                            
    //[ 2 ]
    http_request.onreadystatechange = function() 
    { 
        alertContents(http_request); 
    };
    http_request.open('POST', url, true);
    http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    http_request.send('param=getID');
}                            
////////////////////////////////////////////////////////
                        
function alertContents(http_request) 
{
   if (http_request.readyState ==  4 ) 
   {
      if (http_request.status ==  200 )
      {
         alert(http_request.responseText);
      } 
      else 
      {
          alert('');
      }
  }
}

while(true)
{
   func();
   sleep( 1000 );
}

while(true)
{
   setTimeOut("func()",  1000 ); 
}

while(true)
{
   func();
   sleep( 1000 );
}

func()
{
    setTimeOut("func()",  2000 );
}