php导出下载Excel文件被IE阻止，如何解决？用流输出也不行

php导出下载Excel文件被IE阻止，怎么解决？用流输出也不行！
下载Excel文件被IE阻止，怎么解决？ 
当点击导出按钮时，通过AJAX在后台生成一个excel文件，想直接在页面上弹出文件是否保存的对话框，
无论是通过js的window.location.href='';还是 通过form 提交到新页面都不行，后台通过流方式输出，都被IE阻止； 
请问谁有办法解决？

PHP code

 <br /> $file_name="test.xls"; <br /> $file_path="../data/down/2011/03/21/"; <br /> $file_name = urldecode($file_name); <br />  <br /> // ../ is not allowed in the file name <br /> if (!ereg("(\.\.\/)", $file_name)) <br /> { <br /> // Does the file exist? <br /> 	if (file_exists($file_path . $file_name)) <br /> 	{ <br /> 		$fp = @fopen( $file_path . $file_name, "r" ); <br /> 		//Prompt the user to download the new torrent file. <br /> 		header("Expires: 0" ); <br /> 		header("Pragma:public" ); <br /> 		header("Cache-Control:must-revalidate,post-check=0,pre-check=0" ); <br /> 		header("Cache-Control:public"); <br /> 		header("Content-Type:application/octet-stream" ); <br /> 		 <br /> 		if (strstr($_SERVER["HTTP_USER_AGENT"],"MSIE"))	{ <br /> 			header("Content-Disposition:attachment;filename=".urlencode($file_name) ); <br /> 		}else{ <br /> 			header("Content-Disposition:attachment;filename=".$file_name ); <br /> 		} <br /> 		header("Content-transfer-encoding: binary"); <br /> 		header("Content-length:".@filesize( $file_path . $file_name )); <br /> 		 <br /> 		@fpassthru( $fp ); <br /> 		@fclose( $fp ); <br />  	} <br /> 	exit(); <br /> }  <br />  <br /> 

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