Putting Javascript source, then immediately the page not working

Question

When I put the following code on my page.

<script type="text/javascript" src="../../Scripts/jquery-1.4.1.js" />

Then anything below will became nothing, can anyone tell me why?

Thanks alot.

Sorry, I am very new in web development.

Thanks

Answer 1

Script tags are not allowed to be auto closed:

<script type="text/javascript" src="../../Scripts/jquery-1.4.1.js" ></script>