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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Sandbox</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<style type="text/css" media="screen">
body { background-color: #000; font: 16px Helvetica, Arial; color: #fff; }
</style>
</head>
<body>
    <input type=checkbox name="us" value="Joe" ID="Checkbox1"><br/>
    <input type=checkbox name="us" value="Dan" ID="Checkbox2"><br/>
    <input type=checkbox name="us" value="Sal" ID="Checkbox3"><br/>
    <input type="button" onclick="javascript:check()" value="Test" />
</body>
</html>
 
​
 
  function check() { 
    var anyChecked = false; 
    var checkboxes = document.getElementsByTagName('input'); 
    
    alert(checkboxes.length);
    
    alert('0'+checkboxes[0].checked);
    alert('1'+checkboxes[1].checked);
    alert('2'+checkboxes[2].checked);
    alert('3'+checkboxes[3].checked);
    
    for (i = 0; i < 5; i++) {
    alert("The number is " + i + "<br>");
}
    
    
    for(var i=0; i < 4; i++) { 
      
        alert(i);
        
        
    }  
    alert("Checkboxes checked? " + anyChecked); 
}
Output

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