Throws the exception that the element is undefined.

[GarciaM]

I have a paging control that dynamically adds the individual page numbers for the user to click on, but I noticed that the page didn't want to refresh.

I did a lot of debugging and finally found where it was breaking; it's like it can't find the element h_page:

    function do_Post(pageNum) {
        var frm = document.forms[0];
        try {
        frm.h_page.value = pageNum;
        frm.submit();  
        }
        catch(Error) {
            alert(Error.Message);
        }      
    }

And then right at the top of the page I have to hidden variable:

 <input type="hidden" id="h_page" value=""/>

What could be causing this? I've been stuck on this for a while and none of my googling has brought back anything that has helped me.

[vwphillips]

either give the input a name

<input type="hidden" name="h_page" value=""/>

or

function do_Post(pageNum) {
        var frm = document.forms[0];
        try {
        document.getElementById('h_page').value = pageNum;
        frm.submit();
        }
        catch(Error) {
            alert(Error.Message);
        }
    }

[GarciaM]

Thank you. The latter fixed my problem.
Strange thing is that I have the same function on another website and there the former worked 100%.