on input tag

Hello friends,
Generally when we use input type=file it displays a text box and a button defaultly. When i want to display some filename in that textbox how it is possible?

I searched websites also in some sites they are giving like value='filename' it is the default value. But i tried that coding it does not displaying in textbox. I tried in linux platform.

So, please help me friends how it is possible?Urgent

re: on input tag

It is my understanding that you are not allowed to pre-populate the form field when the type is 'file'. I was told some time back that it is because of potential security problems.

--Kevin