A little help with a dropdown menu please

[Dagenau]

Hello friends.

I need a little help with this code i can't get to work. Under 500.000 euros a link to another website need to open when selected in the dropdown menu.

<input type="hidden" id="budget_min" name="budget_min" value="0" />
<input type="hidden" id="budget_max" name="budget_max" value="0" />

<select onchange="updatePriceLimit(this)"> 
  <option value="http://othersite.com">-500.000 euros</option>
  <option value="500000-1000000">500.000 - 1.000.000 euros</option>
  <option value="1000000-2000000">1.000.000 - 2.000.000 euros</option>
  <option value="2000000-100000000">2.000.000+ euros</option>
</select>

<script type="text/javascript">
function updatePriceLimit(select) {
  if (select.value.search(/http/i)) {
    location.href=select.value;
  } else {
    var limit = select.value.split('-');
    document.getElementById('budget_min').value = limit[0];
    document.getElementById('budget_max').value = limit[1];
  }
}
</script>

Thanks in advance