function reg_check () {

var error="";
if (document.getElementById('pass').value.length != 0 ) {
	
	if (document.getElementById('pass').value.length < 6) { error+="\n密碼不可少於6個字元";}
	if (document.getElementById('pass2').value != document.getElementById('pass').value ) { error+="\n兩次輸入的密碼不同";}
	}
	

if (document.getElementById('email').value.length < 1) { error+="\n會員帳號不可空白";}
if (document.getElementById('realname').value.length < 1) { error+="\n姓名不可空白";}
if (document.getElementById('handphone').value.length < 1) { error+="\n手提電話不可空白";}
if (document.getElementById('pass').value.length == 0) { error+="\n密碼不可空白";}
//if (document.getElementById('zipcode').value.length < 1) { error+="\n郵遞區號不可空白";}
if (document.getElementById('address').value.length < 1) { error+="\n請填寫住址";}


/* 數字驗證 
if (document.getElementById('m_num_check').value == "") { error+="\n請輸入驗證碼 4 位數字";}
else {
if (document.getElementById('m_num_check').value != document.getElementById('m_num_check2').value) { error+="\n驗證碼錯誤";}
}
*/

// 行動電話相關
/*
var len = document.detail.mobile.value.length;
for(var i=0;i<len;i++) {
var c= document.detail.mobile.value.charAt(i);
if(!(c>="0"&&c<="9")) { error+="\n行動電話不可使用特殊字元";}
}
if (len != 10) {error+="\n行動電話為10碼半形數字"; }
*/

//  電子郵件相關
var len = document.getElementById('email').value.length;
for(var i=0;i<len;i++) {
var c= document.getElementById('email').value.charAt(i);
if(!((c>="A"&&c<="Z")||(c>="a"&&c<="z")||(c>="0"&&c<="9")||(c=="-")||(c=="_")||(c==".")||(c=="@"))) { var email_error1="no";}
if((document.getElementById('email').value.indexOf("@")==-1)||(document.getElementById('email').value.indexOf("@")==0)||(document.getElementById('email').value.indexOf("@")==(len-1))) { var email_error2="no";}
if((document.getElementById('email').value.indexOf("@")!=-1)&&(document.getElementById('email').value.substring(document.getElementById('email').value.indexOf("@")+1,len).indexOf("@")!=-1)) { var email_error2="no";}
if((document.getElementById('email').value.indexOf(".")==-1)||(document.getElementById('email').value.indexOf(".")==0)||(document.getElementById('email').value.lastIndexOf(".")==(len-1))) { var email_error2="no";}
}
if (email_error1=="no") {error+="\n電子郵件不可使用特殊字元";}
if (email_error2=="no") {error+="\n電子郵件不正確";}
if (document.getElementById('email').value.length < 1) { error+="\n電子郵件不可空白";}




if (error != "") { alert("請確認下列訊息:\n"+error);}
else { document.getElementById('detail').submit();}
}