Aquí tienes los códigos que puedes consultar en Ver/ Código fuente.
<HEAD>
<script language="JavaScript">
!-- function go(){
if (document.selecter.select1.options[document.selecter.select1.selectedIndex].value
!= "none")
{
location = document.selecter.select1.options[document.selecter.select1.selectedIndex].value
}
}
//-->
< /script>
</HEAD>
<BODY>
<script language="JavaScript">
< !--
document.write('<form name="selecter">< select name="select1" size="1">');
document.write('<option value="none">Seleciona una pagina ...');
document.write('<option value="none">--------');
document.write('<option value="http://www.intel.com">Intel');
document.write('<option value="http://www.microsoft.com">Microsoft');
document.write('<option value="http://poblado.com/artevenus">Artevenus');
document.write('</select>');
document.write('INPUT TYPE="button" VALUE="Ve allí ..." onclick="go()">');
document.write('</form>');
//-->
< /script>
</BODY>