Javascript to check uncheck all checkbox in a Table

<a href="#" id="check_<%= id %>" onclick="checkParent('<%= id %>', true); return false;">All</a>

<a href="#" id="uncheck_<%= id %>" onclick="checkParent('<%= id %>', false); return false;" style="display:none;">All</a>

<table id="table_<%= id %>">
  <tr>
    <td>
      <%= check_box_tag "locations[]", location.id, false, :onchange => "validate();" ,:id => "locations", :class => "location" %>
    </td>
  </tr>
</table>

function checkByParent(aId,aChecked) {
   
    var inputs_in_table = document.getElementById("table_"+aId).getElementsByTagName("input");
    for(var i=0; i<inputs_in_table.length; i++)
    {
        if(inputs_in_table[i].type == "checkbox") inputs_in_table[i].checked= aChecked;
    }
    if (aChecked == true)
    {
      document.getElementById("check_"+aId).style.display = "none";
      document.getElementById("uncheck_"+aId).style.display = ""; 
    }
    else if(aChecked == false)
    {
      document.getElementById("check_"+aId).style.display = "";
      document.getElementById("uncheck_"+aId).style.display = "none"; 
    }
  }