<select onchange="self.location.href='#'+this.options[this.selectedIndex].value">
<option value="a">A</option>
<option value="b">B</option>
...
ciao
<select onchange="self.location.href='#'+this.options[this.selectedIndex].value">
<option value="a">A</option>
<option value="b">B</option>
...
ciao