Show or Hide Elements

[BRawn]

I'm new to ASP.NET and I've been trying write code to show and hide certain elements on link's onclick event, but no matter what I try, nothing's working. Here's my scenario...

I have a MasterPageFile with 3 ContentPlaceHolders. One for navigation (links which call the web forms which populate the main content placeholder), one for sub-categories (should there be) and one for the main content (which gets populated with web forms).

If I have a link which contains sub-categories, the sub-categories ContentPlaceHolder should populate with the links for each sub-category respectively. The idea is to use the sub-category links to jump to a specific place on the page.

The problem I'm having is that I can't seem to show or hide the sub-categories ContentPlaceHolder, no matter what I try. Here's what I've tried:

JavaScript...

 
<script type="text/javascript">
 
    function hideControl(controlID)
    {
        document.getElementById(controlID).style.visibility = 'hidden';
    }
 
    function showControl(controlID)
    {
        document.getElementById(controlID).style.visibility = 'visible';
    }
 
</script>
 
 

 
<script type="text/javascript">
 
    function hideControl(controlID)
    {
 
        document.getElementById(controlID).style.display = 'block';
    }
 
    function showControl(controlID)
    {
 
        document.getElementById(controlID).style.display = 'none';
    }
 
</script>
 
 

I tried using it like this (in my individual web forms):

 
<%@ Page Language="C#" MasterPageFile="~/MasterPageFile.master" Title="Page Title" %>
<asp:Content ID="Content1" ContentPlaceHolderID="mainContent" Runat="Server">
 
<div class="bodyBackgroundLeft_ContentDIV"><a class="subMenuItems" href="#" style="text-decoration: none; padding-right: 92px; overflow: visible" onclick="showControl(Content3)">Link 1</a></div>
<div class="ClassLink"><a class="subMenuItems" href="#" style="text-decoration: none" onclick="hideControl(Content3)">Link 2</a></div>
 
 

I've also tried using the code-behind file, like this:

 
    void hideContentPlaceHolders()
    {
        ContentPlaceHolder cph = (ContentPlaceHolder)this.Page.Master.FindControl("subContent");
        cph.Visible = false;
    }
 
    void showContentPlaceHolders()
    {
        ContentPlaceHolder cph = (ContentPlaceHolder)this.Page.Master.FindControl("subContent");
        cph.Visible = true;
    }
 
 

...and calling it like this:

 
<%@ Page Language="C#" MasterPageFile="~/MasterPageFile.master" Title="Page Title" %>
<asp:Content ID="Content1" ContentPlaceHolderID="mainContent" Runat="Server">
 
<div class="bodyBackgroundLeft_ContentDIV"><a class="subMenuItems" href="#" style="text-decoration: none; padding-right: 92px; overflow: visible" onclick="showContentPlaceHolders()">Link 1</a></div>
<div class="ClassLink"><a class="subMenuItems" href="#" style="text-decoration: none" onclick="hideContentPlaceHolders()">Link 2</a></div>
 
 

The ContentPlaceHolder on my individual web forms look like this:

 
<asp:Content ID="Content3" ContentPlaceHolderID="subContent" runat="server">
    <div class="Link1"><a class="subMenuItems" href="#" style="text-decoration: none; overflow: visible">JumpToSection</a></div>
    <div class="Link2"><a class="subMenuItems" href="#" style="text-decoration: none; overflow: visible">JumpToSection</a></div>
    <div class="Link3"><a class="subMenuItems" href="#" style="text-decoration: none; overflow: visible">JumpToSection</a></div>
</asp:Content>
 
 

And on my MasterPageFile...

 
<div style="width: 185px; position: absolute; z-index: 5; margin-left: 0px; margin-top: 280px;">
            <div class="bodyMenuTop"></div>
            <div style="background-color: White; width: 185px; height: 220px;">
 
                <asp:ContentPlaceHolder ID="subContent" runat="server">
 
                </asp:ContentPlaceHolder>
 
            </div>
            <div class="bodyMenuBottom"></div>
        </div>
 
 

I usually get errors when loading pages using the JavaScript function, using the 'block' and 'none' display. The error message isn't really clear and it doesn't pin-point the location of the error. It usually says I'm missing a '{', but I can't see that I am...

What am I doing wrong?
Any assistance would be appreciated...

[CroCrew]

This is a asp.net question not a Classic ASP question.

CroCrew~