function reg_check () {
var error="";
if (document.detail.pass.value.length != 0) {
	
	if (document.detail.pass.value.length < 6) { error+="\nPassword at least 6 characters";}
	if (document.detail.pass2.value != document.detail.pass.value ) { error+="\npassword not the same";}
	}
//if ( !(document.detail.name.value.charAt(0)>= 'a' && document.detail.name.value.charAt(0) <= 'z') )  { error+="\n符號不可相連";}
if (document.detail.name.value.length < 1) { error+="\nCheck ID";}
if (document.detail.pass2.value != document.detail.pass.value ) { error+="\nPassword not the same";}
if (document.detail.realname.value.length < 1) { error+="\nCheck first name";}
if (document.detail.engname.value.length < 1) { error+="\nCheck last name";}

//if (document.detail.idnumber.value.length == 0) { error+="\n身分證字號不可空白";}


/////  電子郵件相關
var len = document.detail.email.value.length;
for(var i=0;i<len;i++) {
var c= document.detail.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.detail.email.value.indexOf("@")==-1)||(document.detail.email.value.indexOf("@")==0)||(document.detail.email.value.indexOf("@")==(len-1))) { var email_error2="no";}
if((document.detail.email.value.indexOf("@")!=-1)&&(document.detail.email.value.substring(document.detail.email.value.indexOf("@")+1,len).indexOf("@")!=-1)) { var email_error2="no";}
if((document.detail.email.value.indexOf(".")==-1)||(document.detail.email.value.indexOf(".")==0)||(document.detail.email.value.lastIndexOf(".")==(len-1))) { var email_error2="no";}
}
if (email_error1=="no") {error+="\nCheck email";}
if (email_error2=="no") {error+="\nCheck email";}
if (document.detail.email.value.length < 1) { error+="\nCheck email";}
/////

//if (document.detail.zipcode.value.length < 1) { error+="\n郵遞區號不可空白";}
//if (document.detail.addres.value == "路街段巷弄號樓之" || document.detail.addres.value.length < 1) { error+="\n請填寫住址";}

if (error != "") { alert("System Information:\n"+error);}
else { detail.submit();}


}