求助 JS clearTimeout 无效

function update(url,odj){

	var ajax = ((typeof XMLHttpRequest == 'function') ? new XMLHttpReuest() : new ActiveXObject('Microsoft.XMLHTTP'));

	ajax.open('get',url,true);

	ajax.onreadystatechange = function(){

		var flag = false,time;

		if(ajax.readyState == 4 && ajax.status == 200){

			if(ajax.responseText != null){

				flag = true;

				clearTimeout(time);

				$('Progress').style.display = 'none';

				$('Progress').style.backgroundColor = '';

			}

		}else{

			(function(){

					$('Progress').style.display = 'block';

					with($('Progress').firstChild.style){

						if(parseInt(marginRight) > 0){

							marginRight = parseInt(marginRight) - 1;

						}else{

							$('Progress').style.backgroundColor = backgroundColor;

							marginRight = 125;

							backgroundColor = backgroundColor == '#fff' ? '#600' : '#fff';

						}

					}

					time = setTimeout(arguments.callee,10);

					  })();

		} 

	}

	ajax.send(null);

}