function init(){

        setBirthDay();
        
    }

    function isIns(){

        if( ! isDate( parseInt( document.xform.yy.value), parseInt( document.xform.mm.value), parseInt( document.xform.dd.value))){
            
            alert('生日日期格式有誤！');
            document.xform.dd.focus();
            return false;  
            
        }

        if( ! isEmail( document.xform.email.value) || ! isHalfAlpha( document.xform.email.value.replace( /@/g, '')) || document.xform.email.value.replace( /@/g, '').length == 0){
            
            alert('帳號須為有效的電子郵件地址！');
            document.xform.email.focus();
            return false;    
                        
        }
   
    }
    
    function setBirthDay(){
        
        document.xform.birthday.value =  document.xform.yy.value + '/' + document.xform.mm.value + '/' + document.xform.dd.value;
        
    }