Hiding and showing divs using javascript

The attached code snippet gives my attempt to hide and show divs using javascript.  Right now I am not getting any response from any of the radio button clicks and just need some help understanding why.

THE JAVASCRIPT FUNCTION:
 
function show_div(div_id) {
    // hide all the divs
    document.getElementById('url').style.display = 'none';
    document.getElementById('content').style.display = 'none';
 
    // show the requested div
    document.getElementById(div_id).style.display = 'block';
}
 
 
 
THE CALL TO THE JAVASCRIPT FUNCTION
 
		<tr>
			<td align="right">Content Type:
			</td>
			<td>
				Remote: <input type="radio" name="CreativeContentType" value="Remote" <cfif #CreativeContent.CreativeContentType# eq 'Remote'>checked</cfif> onclick="show_div('url'); return false;">
				Hosted: <input type="radio" name="CreativeContentType" value="Hosted" <cfif #CreativeContent.CreativeContentType# eq 'Hosted'>checked</cfif> onclick="show_div('content'); return false;">
			</td>
		</tr>
 
 
 
 
 
THE DEFINED DIVS
 
		<div style="display: none;" id="url">
			<tr>
				<td nowrap align="right" valign="top">URL: 
				
				</td>
				<td nowrap>
					<INPUT TYPE="text" SIZE=80 NAME="RemoteContentUrl" ID="RemoteContentUrl" class="Forminput" value="#CreativeContent.RemoteContentUrl#">&nbsp;
					<input name="Content" type="hidden" value="">
				</td>
			</tr>
		</div>
		<div style="display: none;" id="content">
			<tr>
				<td align="right">Content:
				</td>
	
				<td><input name="RemoteContentUrl" type="hidden" value="">
					<textarea name="Content" id="Content" cols="100" rows="12" wrap="soft" 
						class="OptsFormData">#CreativeContent.Content#</textarea>
				</td>
			</tr> 
		</div>

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