[devote]

<input />
<input />
<input />
<script type="text/javascript">
    var elems = document.getElementsByTagName( 'input' );

    for( var i = 0, elem; elem = elems[ i++ ]; ) {
        elem.onblur = function() {
            alert( "Фокус ушел" );
        }
    }
</script>