<td align="left"><input type="text" name="vcode" id="vcode" style="width:54px" class="input"> <a href="javascript:change('vcode_img')"><img src="../vcode/?s=5577fcb7c5c7edc4107b069fd13ebcee" id="vcode_img" border="0" title="看不清?请点击更换" alt="" align="absmiddle" width="60" height="20"></a></td>
I want to know "../vcode/?s=5577fcb7c5c7edc4107b069fd13ebcee"
What is this