Updated the code again, its still alerting 'HTTP Status: 404 Not Found'
<label class="attribsSelect" for="attrib-2">1. Canvas Size</label></h4>
<div class="back">
<select name="id[2]" id="attrib-2" onchange="getattribimage('id[2]',547,500, this.value,2);">
<option value="16" selected="selected">-- Please Choose --</option>
<option value="17">8x10 (inch)</option>
<option value="18">12x16 (inch) (+£5.84)</option>
<option value="15">20x16 (inch) (+£12.97)</option>
<option value="1">25x20 (inch) (+£24.65)</option>
<option value="3">30x25 (inch) (+£29.19)</option>
<option value="2">40x30 (inch) (+£42.16)</option>
</select>
</div>
<br class="clearBoth" />
</div>
<script type="text/javascript">
document.getElementById("id[2]").addEventListener("change",getattribimage("id[2]",547,500, this.value,5),false);
</script>