Yep PostBack variable is off limits, use your own variable and check it something like so...

If Page.IsPostBack AND MyVar = True Then
MyVar = False
Else
MyVar = True
End If

I'm not sure if this is a problem you've been having when you say "... It worked initially but something else further down the line didn't work ..."

Be aware that if you set a variable before...

You almost have it, use "Key", or "Value" for datasource assignment and a DataReader to populate values from database query...
Dim linkrd = New HashTable()

While reader.Read()
...

It sounds to me like you could try checking if it's a postback then execute proper code, because Page_Load will execute every time, no matter post back or a regular visit.

If Not Page.IsPostBack...

When I say that I suggest not using CSS in .NET, it means that use only when you have to, like dynamically resizing panels, etc. Does the above code not produce proper results in Firefox? Not to put...

I suggest NOT using .NET to style your form elements, but rather and external style sheet.

... using ids or classes to style your form elements. Firefox (I asume this is the Mozzila version your...