combobox - mouseover on Combo box in javascript not working -

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i have static combo box in html default value selected , other values can select drop down. want call javascript function onmouseover. not working. can associate events combo box ?

here's html:

<select id="sel">     <option>foo</option> <select>

and js:

document.getelementbyid('sel').onmouseover = function() {     alert('bar') }

works fine. can see here - http://jsfiddle.net/tszuk/


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