function stringTrim(str)
{
    if(str.length > 0)
        while(str.indexOf(' ') == 0)
            str = str.substr(1);
    if (str.length > 0)
        while(str.lastIndexOf(' ') == str.length-1)
            str = str.substr(0, str.length-1);
    return str;
}

function isValidEmail (emailIn)
{
	var isEmailOk = false;

	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9_\-])+\.)+([a-zA-Z_]{2,4})+$/;


	if(emailIn.search(filter) != -1)
		isEmailOk = true;
	if(emailIn.indexOf("..") != -1)
		isEmailOk = false;
	if(emailIn.indexOf(".@") != -1)
		isEmailOk = false;
	if(emailIn.indexOf("'") != -1 || emailIn.indexOf("''") != -1 || emailIn.indexOf("\"") != -1 || emailIn.indexOf("\"\"") != -1 || emailIn.indexOf("(") != -1  ||  emailIn.indexOf(")") != -1 || emailIn.indexOf("[") != -1 || emailIn.indexOf("]") != -1 || emailIn.indexOf("{") != -1  || emailIn.indexOf("}") != -1 || emailIn.indexOf(",") != -1 || emailIn.indexOf(",,") != -1 || emailIn.indexOf(":") != -1 || emailIn.indexOf(";") != -1 || emailIn.indexOf("#") != -1 || emailIn.indexOf("mailto:") != -1)
		isEmailOk = false;

	return isEmailOk;
}

function validateNewsletter()
{
	//var frm = document.form42;
	var email = document.getElementById("Field1").value;
	if(stringTrim(email) == "")
	{
		alert("Please enter your email address.") ;
		document.getElementById("Field1").focus();
		return false ;
	}
	else
	{
		if(!isValidEmail(email))
		{
			alert("Please enter a valid email address.");
			document.getElementById("Field1").focus();
			return false;
		}	
	}
	return true;
}