function checkdata() 
{ 
var username=document.getElementById("username")
if(username.value==""){
userEmpt.innerHTML="用户名不能为空";
username.focus();
return false;
}
else{
userEmpt.innerHTML=""
}
var pwd=document.getElementById("pwd")
if(pwd.value==""){
pwdEmpt.innerHTML="密码不能为空";
pwd.focus();
return false;
}
else{
pwdEmpt.innerHTML=""
}
var pwd1=document.getElementById("pwd1")
if(pwd1.value==""){
pwd1Empt.innerHTML="请确认密码";
pwd1.focus();
return false;
}
else if(pwd1.value!=pwd.value){
pwd1Empt.innerHTML="两次密码输入不一致"
pwd1.focus();
return false;
}
else{
pwd1Empt.innerHTML=""
}
var mctname=document.getElementById("mctname")
if(mctname.value==""){
mctnameEmpt.innerHTML="商家名不能为空";
mctname.focus();
return false;
}
else{
mctnameEmpt.innerHTML=""
}
var merchant=document.getElementById("merchant")
if(merchant.value==""){
merchantEmpt.innerHTML="商家英文名不能为空";
merchant.focus();
return false;
}
else{
merchantEmpt.innerHTML=""
}
var url=document.getElementById("url")
if(url.value==""){
urlEmpt.innerHTML="商家网址不能为空";
url.focus();
return false;
}
else{
urlEmpt.innerHTML=""
}
var mctintro=document.getElementById("mctintro")
if(mctintro.value==""){
mctintroEmpt.innerHTML="商家简介不能为空";
mctintro.focus();
return false;
}
else if(mctintro.value.length>500){
mctintroEmpt.innerHTML="商家简介不要超过500字"
mctintro.focus();
return false;
}
else{
mctintroEmpt.innerHTML=""
}
var custphone=document.getElementById("custphone")
if(custphone.value==""){
custphoneEmpt.innerHTML="客服电话不能为空";
custphone.focus();
return false;
}
else{
custphoneEmpt.innerHTML=""
}
var contactname=document.getElementById("contactname")
if(contactname.value==""){
contactnameEmpt.innerHTML="联系人姓名不能为空";
contactname.focus();
return false;
}
else{
contactnameEmpt.innerHTML=""
}
var agreement=document.getElementById("agreement")
if(!agreement.checked){
agreementEmpt.innerHTML="请确认阅读协议";
agreement.focus();
return false;
}
else{
agreementEmpt.innerHTML=""
}
{ var str=document.getElementById("email")
 var reg= /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
 if (reg.test(str.value)==false)
 {
   emailEmpt.innerHTML="Email地址格式不正确"
   str.focus();
   return false;
 }
}

return true;
}