function ClearText(textbox, text) {
    if (textbox.value == text)
    {
        textbox.value = "";
    }
}

function PopulateText(textbox, text) {
    if (textbox.value == "") {
        textbox.value = text;
    }
}

function newsletterSubscribe(frmNewsletter) {
    if (frmNewsletter.txtName.value == '') {
        alert('Please enter your name');
        return false;
    } else if (frmNewsletter.txtEmail.value == '') {
        alert('Please enter your email address');
        return false;
    } else if (echeck(frmNewsletter.txtEmail.value) == false) {
        alert('Please enter a valid email address');
        return false;
    } else {
        return true;
    }
}


function echeck(str) {
    var at = "@"
    var dot = "."
    var lat = str.indexOf(at)
    var lstr = str.length
    var ldot = str.indexOf(dot)
    if (str.indexOf(at) == -1) {
        // alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {
        //  alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {
        //  alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(at, (lat + 1)) != -1) {
        //  alert("Invalid E-mail ID")
        return false
    }

    if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {
        //  alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(dot, (lat + 2)) == -1) {
        //  alert("Invalid E-mail ID")
        return false
    }

    if (str.indexOf(" ") != -1) {
        //  alert("Invalid E-mail ID")
        return false
    }

    return true
}