在input输入框中回车激活点击按钮事件代码

                <div class="dlchuangkou">

                    <p class="metingNumber">
                        会议码：<input id="txtMetingNumberID" runat="server" type="text" value="在此输入会议码" onkeypress="if(event.keyCode==13) {btnValidate.click();return false;}" onfocus="if(this.value=='在此输入会议码'){this.value='';}" onblur="if(this.value==''){this.value='在此输入会议码'}" class="dltxt01" />
                    </p>
                    <p class="Numberbutton">
                        <input type="button" id="btnValidate" value="进入会议" class="dlButton" />
                    </p>
                </div>                <div class="dlchuangkou">