Canceling The Submition Of A Form

Jul 20, 2005

i have a form made up of 2 file inputs and a submit button..
the imputs are to upload images, namley jpeg's for a e-greatings thing im
working on.

this only works with jpegs so i have a script that will check the value of
the imput tag to make sure it ends with .jpg, .jpeg.

this works fine on the jubmit button using

onclick="myHandler(this)"

it works fane that it alerts the user that only jpegs are valid but then
when the alert
has been ok'd it continues to submit the form to my php script.

how can i get this to cancle the submit action?

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