<script src="prototype.js"></script>
<div id="div1" style="font-size:20px;font-weight:bold">
ObjectRange
</div>
<script> 
var range = $R(1, 10, false);
var range2 = $R(1, 10, true);

alert(range.merge(range2));
// true
alert(range.include(1));
// true
alert(range.include(5));
// true
alert(range.include(10));

// true
alert(range2.include(1));
// true
alert(range2.include(5));
// false
alert(range2.include(10));
</script>