子窗体操作:window.opener.document.getElementById("contract_no").disabled="disabled";
父窗体:<td class="pactGrayT"><bean:message  key="support.po.app.contract_no" /><bean:message key="support.msg.colon" />
              <input name="applicant_telephone3" type="text" style="width:200px;" id="contract_no" value="">
              <input name="contract_noinfohidden" type="hidden" id="contract_noinfohidden">