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<div>"John" is found at index <span></span></div>
<div>4 is found at index <span></span></div>
<div>"Karl" is not found, so it returns <span></span></div>
<div>"Pete" is in the array, but not at an index greater than 2, so it returns <span></span></div>
<script>
$(function () { 
    var arr = [ 4, "Pete", 8, "John" ];
    var $spans = $( "span" );
    $spans.eq( 0 ).text( jQuery.inArray( "John", arr ) );
    $spans.eq( 1 ).text( jQuery.inArray( 4, arr ) );
    $spans.eq( 2 ).text( jQuery.inArray( "Karl", arr ) );
    $spans.eq( 3 ).text( jQuery.inArray( "Pete", arr, 2 ) );
})
</script>