I have a asp page that includes a master page. I have placed a hidden input inside the content holder but it does not seem to be accessible via the java script.

<input type="hidden" id="rowindex" runat="server" />

I do not get any errors when referencing this field in the code behind, but I can't seem to access it from java script. Also, when I view page source, it isn't there. Many others are that I don't have anything to do with, but mine is not there. Anybody know where I need to place this for it to be available?
Thanks
Tim