function checkdata() 
{ 
var errormsg=document.getElementById("errormsg");
var username=document.getElementById("username");
if(username.value==""){
	errormsg.innerHTML="***用户名不能为空***";
	username.focus();
	return false;
}
else{
	errormsg.innerHTML=""
}
var pwd=document.getElementById("pwd")
if(pwd.value==""){
	errormsg.innerHTML="***请设置密码***"
	pwd.focus();
	return false;
}
else if(pwd.value.length<2){
	errormsg.innerHTML="***密码应为6-12位之间***";
	pwd.focus();
	return false;
}
else{
	errormsg.innerHTML=""
}
var pwd1=document.getElementById("pwd1")
if(pwd1.value==""){
	errormsg.innerHTML="***请输入确认密码***"
	pwd1.focus();
	return false;
}
else if(pwd1.value!=pwd.value){
	errormsg.innerHTML="***两次输入密码不一致***"
	pwd1.focus();
	return false;
}
else{
	errormsg.innerHTML=""
}
var email=document.getElementById("email");
var reg= /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
if (reg.test(email.value)==false)
 {
   errormsg.innerHTML="***email格式不正确哦***";
   email.focus();
   return false;
 }
else{
	errormsg.innerHTML=""
}

var safecode=document.getElementById("safecode");
if (safecode.value==""){
	errormsg.innerHTML="***请输入验证码***";
	safecode.focus();
	return false;
	}
else{
	errormsg.innerHTML=""
	}
return true;
}