How to chek the content type thru java script !!

Hii Guys ,one more prb,
I need to develop a file uploading utility in struts to upload ZIP files(only ZIP), and i sucseeded to do it using the commons.fileupload which comes along with the WSAD5.1(examples), but the prb is i need to chek for the MIME type and need to reject if its not a zip file, if i do this in actionclass, its waiting till the uploading process of the file is finished and finally its displaying file is not the a ZIP, i need to do this validation as the request comes to the server side, i cant not do this in clint side cause my design should not allow me to use any java script..so please let me know is there any way to specify in the controller it self .
if i use java script, how can i do the Content type validation ?
thanx in advance

so definetly u mean , we need to wait till the
filegot uploaded to server, if we use server side
validation?Well, for server side validation, yes you have to wait for the file to upload.
I've always kinda disliked that, since it could be a big file and/or slow connection. But short of possibly using JS to check the filename (and I don't remember if you actually can, and it's not accurate in many case), there's nothing else you can do.

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How to chek the content type thru java script !!

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