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document.getElementById("wl_channel").options[0].innerHTML ="text";
document.getElementById("wl_channel").options[0].value="value";
<select name = "wl_channel" class="select need_res_select" style="width:200px;" id = "wl_channel" onChange = "enCtl('Apply');">
<option value = "auto"></option>
<option value = 1>1</option>
<option value = 2>2</option>
<option value = 3>3</option>
<option value = 4>4</option>
<option value = 5>5</option>
<option value = 6>6</option>
<option value = 7>7</option>
<option value = 8>8</option>
<option value = 9>9</option>
<option value = 10>10</option>
<option value = 11>11</option>
<option value = 12>12</option>
<option value = 13>13</option>
<option value = 14>14</option>
</select>
<script type="text/javascript">
function enCtl(str)
{
document.getElementById("wl_channel").options[0].innerHTML = str;
}
</script>