function trim(str) {
	return str.replace(/^\s+|\s+$/g,'');
}

function checkNumber(textBox) {
	while (textBox.value.length > 0 && isNaN(textBox.value)) {
		textBox.value = textBox.value.substring(0, textBox.value.length - 1)
	}	
	textBox.value = trim(textBox.value);
}

function isEmpty(formElement, message) {
	formElement.value = trim(formElement.value);
	
	_isEmpty = false;
	if (formElement.value == '') {
		_isEmpty = true;
		alert(message);
		formElement.focus();
	}	
	return _isEmpty;
}
function isNotSelected(listElement, message) {
	_isNotSelected = false;
	if (listElement.selectedIndex == 0) {
		_isNotSelected = true;
		alert(message);
		listElement.focus();
	}	
	return _isNotSelected;
}
function setSelect(listElement, listValue) {
	for (i=0; i < listElement.options.length; i++) {
		if (listElement.options[i].value == listValue)	{
			listElement.selectedIndex = i;
		}
	}	
}
function checkEmailAddress(formElement) {
	var at="@";
	var dot=".";
	var lat=formElement.value.indexOf(at);
	var lstr=formElement.value.length;
	var ldot=formElement.value.indexOf(dot);
	
	if (formElement.value.indexOf(at)==-1){
		return false;
	}
	if (formElement.value.indexOf(at)==-1 || formElement.value.indexOf(at)==0 || formElement.value.indexOf(at)==lstr){
		return false;
	}
	if (formElement.value.indexOf(dot)==-1 || formElement.value.indexOf(dot)==0 || formElement.value.indexOf(dot)==lstr){
		return false;
	}
	if (formElement.value.indexOf(at,(lat+1))!=-1){
		return false;
	}
	if (formElement.value.substring(lat-1,lat)==dot || formElement.value.substring(lat+1,lat+2)==dot){
		return false;
	}
	if (formElement.value.indexOf(dot,(lat+2))==-1){
		return false;
	}	
	if (formElement.value.indexOf(" ")!=-1){
		return false;
	}
	 
	 return true;					
}
function validateRegister() {
	with (window.document.formSignup) {
		if (isEmpty(user_name, 'Please enter your Name.')) {
			return false;
		} else if (isEmpty(user_email, 'Please enter your Email Address.')) {
			return false;
		} else if (checkEmailAddress(user_email) == false) {
			alert("Please enter a valid email address.")
			user_email.focus();
			return false;
		} else {
			alert("Thank you for subscribing to our e-news.")
			return true;
		}
	}
}