javascript post not working

I followed the directions in the documentaton for “Javascript in Posts”. I put my script.js in the root then I put the code for access the file in the header.php above style. I called it like this —
<input type=”submit” onclick=”<script type=”text/javascript”>
<!–
validate();
//–></script> ” value=”Send” />

It doesn’t work of course. Thanks for the help in advance :]