function isNab(id){  
	var tmp  
	var z="0123456789"  
	var nab=id.value.length-1;  
	for (var i=0;i<=nab;i++){  
		tmp=id.value.substr(i,1)  
		if (z.indexOf(tmp) == -1) { return false; }  
		}
	if(id.value != "0") return true;   
	else return false;  
}  

function isNumber(val){
	var reg = /^[0-9]*$/;
	return reg.test(val);
}

function isEmail(email) {
	regularExpression = /^[^\s]+@[^\s]+\.[^\s]{2,3}$/;
	if (regularExpression.test(email)) {
		return true;
	}else{
		return false;
	}
}

function isTwMobile(mobile){
	
	if (mobile.length!=10) return false;
	var reg = /^09[0-9]*$/;
	
	return reg.test(mobile);
}

/*
		var reg = /^09[0-9]*$/;
		if (reg.test(f.mobile.value)==false){
			alert('請輸入正確的手機號碼！');
			f.mobile.focus();
			return false;
		}
*/