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how to make "Select All" for checkbox???

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is there any example of code of how to make "select all" check box????

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if (isset($_GET['box'])) foreach($_GET['box'] as $v) {
echo "Box $v is checked <br>";
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Test check boxes</title>
<SCRIPT language="javascript">
        function checkall(form) {
              for (var i=0; i<form.elements.length; i++) {
              if (form.elements[i].type == "checkbox") {
              form.elements[i].checked = true;
<input type="button" name="chkall" value="All"  onclick="checkall(this.form)">
<input type="checkbox" name="box[]" value="123"> Select 123<br>
<input type="checkbox" name="box[]" value="124"> Select 124<br>
<input type="checkbox" name="box[]" value="125"> Select 125<br>

<INPUT TYPE="submit" value="Submit">

(Moving to javascript forum)

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