function num_Check(field){
	if ((event.keyCode<48) || (event.keyCode>57)){
		alert("¼ýÀÚ¸¸ ÀÔ·Â °¡´ÉÇÕ´Ï´Ù.");
		field.value = "";
		field.focus();
		event.returnValue=false;
	} else{
		event.returnValue=true;
	}
}
function nextFocus(F, F_length, Focus_name){
	if(F.value.length == F_length){
		Focus_name.focus();	
	}
}
function chenge_Mail(){
	var mail_list = document.myform.email_list.value;

	if(mail_list != "self"){
		document.myform.email3.value = mail_list;
	} else{
		document.myform.email3.value = '';
		document.myform.email3.focus();
	}
}