function checkBookService(){
	if(this.cs_name.value=="" || this.cs_name.value==null){
		window.alert(T_NAME_REQUIRED);
		this.cs_name.focus();
		return false;
	}
	if (isNaN(this.cs_name.value)==false){
		window.alert(T_NAME_TYPE);
		this.cs_name.focus();
		return false;
	}
//email
	var regex = /^(([\-\w]+)\.?)+@(([\-\w]+)\.?)+\.[a-zA-Z]{2,4}$/;
	if(this.cs_email.value=="" || this.cs_email.value==null){
		window.alert(T_EMAIL_REQUIRED);
		this.cs_email.focus();
		return false;
	}
	if (!regex.test(this.cs_email.value)){
		window.alert(T_EMAIL_TYPE);
		this.cs_email.focus();
		return false;
	}
return true;
}