$("#zphone").click(function(){

			var tel2 = $("#regTel").val();

			if(flag.tel){

				$.post(

						"<%=path%>/main/login_regCode.action",

						{"tel":tel2},

						function(data){

							if(data){

								if(data == "has"){

									RemainTime();

								}

							}

						}

					);

				return false;

			}else{

				alert("必须为移动用户！");

			}

		});

var iTime = 59;

	var Account;

	function RemainTime(){

		document.getElementById('zphone').disabled = true;

		var iSecond,sSecond="",sTime="";

		if (iTime >= 0){

			iSecond = parseInt(iTime%60);

			iMinute = parseInt(iTime/60);

			if (iSecond >= 0){

				if(iMinute>0){

					sSecond = iMinute + "分" + iSecond + "秒";

				}else{

					sSecond = iSecond + "秒";

				}

			}

			sTime=sSecond;

			if(iTime==0){

				clearTimeout(Account);

				sTime='获取手机验证码';

				iTime = 59;

				document.getElementById('zphone').disabled = false;

			}else{

				Account = setTimeout("RemainTime()",1000);

				iTime=iTime-1;

			}

		}else{

			sTime='没有倒计时';

		}

		document.getElementById('zphone').value = sTime;

		if(iTime == 0){

			alert("验证码超时！");

		}

	}

界面：

 <li>

   <label>验 证 码：

         <input type="text" name="code" class="ipt"  id="regCode"/>

         <input type="submit" id="zphone"  value="发送验证码" class="submitBtn1" />

           <font color="#ff0000">* 不能为空</font>

     </label>

</li>