Checkbox - Automatisch markieren

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<script type="text/javascript">
<!--
function checkedall(checked)
{
  for (var i = 0; i < document.forms[0].elements.length; i++) {
    document.forms[0].elements[i].checked = checked;
  }
}

//-->
</script>

<form method="post" action="vokabeln.php">

<a href="#" onclick="checkedall(true)" /> alle</a>
<a href="#" onclick="checkedall('german')" /> Deutsche</a>
<a href="#" onclick="checkedall('english')" /> Englische</a>
<a href="#" onclick="checkedall(false)" /> keine </a>

<br><br>

<input type="checkbox" name="i[1]" value="1" />Interessengebiet-1
<input type="checkbox" name="i[2]" value="1" />Interessengebiet-2

<br><br>

<input type="checkbox" name="p[1]" value="1" />Provider-1
<input type="checkbox" name="p[2]" value="1" />Provider-2

</form>

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<script type="text/javascript">


function checkedall(field,country)
{
         for (var i = 0; i < document.forms[0].elements.length; i++) {

                 if(document.forms[0].elements[i].type=='checkbox' && document.forms[0].elements[i].name[0]==field) {
                         if(country=='all')               document.forms[0].elements[i].checked = true;
                         else if(country=='neither')      document.forms[0].elements[i].checked = false;
                         else if(document.forms[0].elements[i].id==country)      document.forms[0].elements[i].checked = true;
                         else                                                    document.forms[0].elements[i].checked = false;
                 }

         }

}
</script>
<a href="#" onclick="checkedall('p','all')" /> alle</a>
<a href="#" onclick="checkedall('p','de')" /> Deutsche</a>
<a href="#" onclick="checkedall('p','en')" /> Englische</a>
<a href="#" onclick="checkedall('p','neither')" /> keine </a>

<br><br>
<form method="post" action="vokabeln.php">

<input name="i[1]" type="checkbox" id="de" value="10/10/13" />DE<br />
<input name="i[2]" type="checkbox" id="de" value="10/11/13" />DE<br />
<input name="i[3]" type="checkbox" id="en" value="10/11/14" />EN<br />
<br><br>

<input name="p[1]" type="checkbox" id="de" value="10/10/13" />DE<br />
<input name="p[2]" type="checkbox" id="de" value="10/11/13" />DE<br />
<input name="p[3]" type="checkbox" id="en" value="10/11/14" />EN<br />

</form>