Multi page function with links on drop-down

[ChatGenius]

I have put together a multi page function, so there are multiple pages within the same webpage, and I would like the links to the multiple pages to be accessible via a drop-down rather than normal links. I have found a code for this, however it doesn't seem to be working for some reason.

<div style='width:400px; height:400px; background-color:white; border-style:solid; border-color:#000000; border-width:1px; overflow:hidden;'>
<script>
 function goToPage(url)
 {
 if (url != "")
 {
 .open(url);
 }
 }
</script>
<form>
 <label>Select a page:</label>
 <select accesskey="S" onchange="goToPage(this.options(this.selectedIndex).value)">
 <option selected>Please select one</option>
 <option value="#page1">Page 1</option>
 <option value="#page2">Page 2</option>
 <option value="#page3">Page 3</option>
 <option value="#page4">Page4</option>
 </select>
</form>
	
	<a name='page1'></a>
	<div style='width:400px; height:400px; overflow:auto;'>
	this is page 1
	</div>
	
	<a name='page2'></a>
	<div style='width:400px; height:400px; overflow:auto;'>
	this is page 2
	</div>
	
	<a name='page3'></a>
	<div style='width:400px; height:400px; overflow:auto;'>
	this is page 3
	</div>
	
	<a name='page4'></a>
	<div style='width:400px; height:400px; overflow:auto;'>
	this is page 4
	</div>
</div>

Any help is greatly appreciated.
Thanks.