// JScript File

function clearField(txtBox) {

    if (txtBox.id.indexOf("txtEmail") > -1 && document.getElementById(txtBox.id).value == "your email address") {
        document.getElementById(txtBox.id).value = "";
    } else if (txtBox.id.indexOf("txtPhone") > -1 && document.getElementById(txtBox.id).value == "your mobile number") {
        document.getElementById(txtBox.id).value = "";
    } else if (txtBox.id.indexOf("txtName") > -1 && document.getElementById(txtBox.id).value == "your first name") {
        document.getElementById(txtBox.id).value = "";
    } else if (txtBox.id.indexOf("Friends") > -1 && document.getElementById(txtBox.id).value == "invite your friends - one per line - and increase your chances") {
        document.getElementById(txtBox.id).value = "";
    }

}