I need help handling NULLs.  Where is fails is the "    if((_values != null)

the ... = "" statement.  When I add a window.alert statement, it returns a
NULL, but the IF clause here fails for some reason and ...

I have a custom property defined for a .NET TextBox called DependentField.
I'm trying to access this property in Jscript using:
         var strDependentField =
document.getElementById(sName).DependentField;

The following js has error when I select item from a pull down menu. It
cannot direct me to the right page.
<SCRIPT language=JavaScript>
    function changeSel(sel) {

I have an image button (called ibtnBack) that I want when clicked he go to
the previous page, just like it happens when you press back button of
Internet Explorer.
For that I already used this two things in Page_Load, but both don't worked:

Where is a reference manual for using client-side javascript on ASP.NET
pages?
Example: How do you iterate thru all the checkboxes in a checkboxlist
control on a web form (.aspx) to determine which checkboxes are checked?

First, let me say that this is my first attempt to do anything with
Jscript.NET, so I really have no clue what I'm doing
I have written a small little launcher app that launches a different
program depending on which button the user clicks. No problems there,