function alertField(text) {
    document.getElementById('alert').innerHTML = text;
}
function checkPhone(area,prefix,suffix) {
    var v = true;
    if(isEmpty(area))
        alertField("Please enter your phone number with area code");
    else if(isNaN(area.value))
        alertField("Your phone's area code must be a number");
    else if(area.value.length<3)
        alertField("3 digits are required for your phone's area code.");
    else if(isEmpty(prefix))
        alertField("Please enter your phone prefix.");
    else if(isNaN(prefix.value))
        alertField("Your phone's prefix must be a number");
    else if(prefix.value.length<3)
        alertField("3 digits are required for your phone's prefix.");
    else if(isEmpty(suffix))
        alertField("Please enter your phone's suffix.");
    else if(isNaN(suffix.value))
        alertField("Your phone's suffix must be a number");
    else if(suffix.value.length<4)
        alertField("4 digits are required for your phone's suffix.");
    else
        v = false;
    return(v);
}
function isEmpty(v) {
    var t = false;
    var s = new String(v.value);
    if(s=="") t = true;
    return(t);
}
function isEmailEmpty(v) {
    var t = isEmpty(v);
    var p = new String(v.value);
    if(!t) {
        if(p.indexOf(".")==-1)
            t = true;
        else if(p.indexOf("@")==-1)
            t = true;
    }
    return(t);
}