Conditional csv file upload

I would like to upload a csv file conditionally - so only if it is a file with the extension .csv. How can I put the regular expression validation into HTMLDB or, more exactly, in the File Browse text field??
Thank you for any assistance!
Tom

Vikas
If anyone's interested, my final, finally working, code to validate the length of a file name for uploading. I didn't know the \ was an escape character so that took another couple hours to figure out!
I did discover that the limit on file name characters is 74. Not sure why but I had to use 78 in the javascript to correspond to a 74 character filename.
Bill
function checkLength()
var p_file_name = document.getElementsByName('p_t05')[0].value
var p_index = p_file_name.lastIndexOf("\\")
p_file_name = p_file_name.substring(p_index+1)
var p_length = p_file_name.length
if (p_length > 78)
{alert("The file name is too long. Please rename it with 74 characters or less.")}
else
{doSubmit('UPLOAD')}
}

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