<select name="selSS1" id="selSeaShells1">
<option value="val0">sea zero</option>
<option value="val1">sea one</option>
<option value="val2">sea two</option>
<option value="val3">sea three</option>
<option value="val4">sea four</option>
</select>
<input type="button" value="alert" onclick="ff()" />
<script>
function ff(){
var sel = document.getElementById('selSeaShells1')
alert( sel.options[sel.selectedIndex].innerHTML )
}
</script>