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[web] javascript onclick on 'select' element (combobox)

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I'm trying to make a combobox that, when a new item is selected in it, navigates the browser to a new page based on the entry in the combobox. I've googled for "html select onclick", "html select javascript onclick navigate", etc., but haven't been able to find anything. Currently it looks something like this:
<script>
function Chart(qs)
{
	window.location.href = 'http://www.nda.com/traffic_chart.php' + qs;
}		
</script>
<select>
	<option></option>
	<option onclick="Chart('?Month=5&Year=2006');">May 2006</option>
	<option onclick="Chart('?Month=6&Year=2006');">June 2006</option>
	<option onclick="Chart('?Month=7&Year=2006');">July 2006</option>
</select>

This doesn't work very well. If I click on the box, it runs the script before I select a new item in the box. How do I do this?

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<select onchange="if (this.selectedIndex > 0) document.location.href='http://www.nda.com/traffic_chart.php?' + this.value;">
<option></option>
<option value="Month=5&Year=2006">May 2006</option>
<option value="Month=6&Year=2006">June 2006</option>
<option value="Month=7&Year=2006">July 2006</option>
</select>



Obviously, feel free to use a function if you want to avoid the inline JS.

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