Urgent- Checking file when selected for upload

hi,
in my application, i am using the file upload.i am using "input type=file" .however, as it gives a text box along with the browse button,if i enter any garbage file name,is there any way to validate the file name?
thanks in advance

hi,
thanks for your reply,i have done the other validations and checks,only thing i am looking solution for is to check the file existance.
this is necessary since if i enter some "abcd" name in the text box.it creats a file of that name on server side with 0 KB size.
so i want to check the file existance on client side only,and if file exists then only submit the form
is there any way out?
thanks in advance

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