// JavaScript Document
function isNumber(targets){
	if(isNaN(targets.value)){
		return false;
	}else{
		return true;
	}
}
function checkvalue(){
	var form = document.f1;
	if(form.posEmail.value == ""){
   	 alert("Required field, email address must be a valid email address."); 
     form.posEmail.focus();
	 return false;
   }else if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.email.value))) {
   	 alert("Required field, email address must be a valid email address."); 
     form.posEmail.focus();
	 return false;
   }else {
	 return true;
  }
}