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I appologize. &nbsp;This code works as it is. &nbsp;I found the error to be another routine that was trying to disable a validator. &nbsp;Which isn't allowed in Firefox. &nbsp;
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nobody provided the correct solution but thanks for answering.
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<div class="content wysiwyg-content">
I am trying to change an asp:image controls imageUrl from javascript. &nbsp;My code is below:<br />
<br />
function MakeInfoRequired(ImageCont<wbr />rol, MakeRequired)<br />
{<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var infoButton = document.getElementById(Im<wbr />ageControl<wbr />);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (infoButton)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var ImgSource;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (MakeRequired == true)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ImgSource = &quot;/templates/images/require<wbr />d_info_but<wbr />ton.gif&quot;; <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ImgSource = &quot;/templates/images/info_bu<wbr />tton_reduc<wbr />ed.gif&quot;; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;infoButton.src = ImgSource;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
}<br />
<br />
This works fine in Internet Explorer but I am trying to make it compatible with Netscape &amp;&nbsp;Firefox. &nbsp;Specifically Netscape 8.1+ and Firefox 2+. &nbsp;I have tried them both and this doesn't work. &nbsp;I am using ASP.Net 1.1, C#.<br />
<br />
I cannot find any documentation on how to do 
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I am trying to change an asp:image controls imageUrl from javascript.  My code is below:

function MakeInfoRequired(ImageControl, MakeRequired)
{
	var infoButton = document.getElementById(ImageControl);
	if (infoButton)
	{
		var ImgSource;
		if (MakeRequired == true)
		{
			ImgSource = "/templates/images/required_info_button.gif"; 
		}
		else
		{
			ImgSource = "/templates/images/info_button_reduced.gif"; 		}
		infoButton.src = ImgSource;
	}
}

This works fine in Internet Explorer but I am trying to make it compatible with Netscape & Firefox.  Specifically Netscape 8.1+ and Firefox 2+.  I have tried them both and this doesn't work.  I am using ASP.Net 1.1, C#.

I cannot find any documentation on how to do 

How to toggle an Image control from Cross-Browser Javascript

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications