[jQuery] option in a select

[jQuery] option in a select

Hi
Sorry if this is a newbie question but I'm trying to use jquery for a simple form validation
Example I got a select id mySelect
how can I check if the selected option value is egual to none ?
I tried this but it doesn't seems to work
    $('destination').find('option').each(function(){
        if(this.selected && this.value=='None'){
            alert('please select a destination')
        }
    })
how do I determine the type of $('mySelect') like
document.getElementById('mySelect').type
<select id="mySelect">
<option value="none">select</option>
<option value="1">choice 1</option>
</select>
Many thanks
Laurent
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