headers already sent

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When I insert the following header:

     header ("Content-type: application/vnd.ms-excel");
     header ("Content-Disposition: attachment" );

I get the messages:

*Warning*: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Group\Apache2\htdocs\trial.php:2) in *C:\Program Files\Apache Group\Apache2\htdocs\trial.php* on line *3*

*Warning*: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Group\Apache2\htdocs\trial.php:2) in *C:\Program Files\Apache Group\Apache2\htdocs\trial.php* on line *4


*I get similar messages when I use my web host. How do I use these headers correctly?


Matt




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