Check all check boxes and check specific check box in an array
<p>I am using this <strong>javascript</strong> function for checking all check box...it's working fine but if I want to check a specific check box 1 or 2 or more then I get an array of all but I didn't get specific check box value please tell me if any function in javascript or jQuery exists to do this. </p>

<pre><code>var checkflag = "false";

function check(field) {
  if (checkflag == "false") {
      for (i = 0; i &lt; field.length; i++) {
          field[i].checked = true;
      }
      checkflag = "true";
      return "Uncheck All";
  } else {
      for (i = 0; i &lt; field.length; i++) {
          field[i].checked = false;
      }
      checkflag = "false";
      return "Check All";
  }
}
</code></pre>
