function validateEmpty(fld) 
{
    var error = "";
    if (fld.value.length == 0) 
    {
        fld.style.background = 'Red'; 
        error = "The required field has not been filled in.\n"
    } 
    else 
    {
        fld.style.background = 'White';
    }
    return error;  
}

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

function validateEmail(fld) 
{
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
   
    if (fld.value == "") 
    {
        fld.style.background = 'Red';
        error = "You didn't enter an email address.\n";
    } 
    else if (!emailFilter.test(tfld)) 
    {              //test email for illegal characters
        fld.style.background = 'Red';
        error = "Please enter a valid email address.\n";
    } 
    else if (fld.value.match(illegalChars)) 
    {
        fld.style.background = 'Red';
        error = "The email address contains illegal characters.\n";
    } 
    else 
    {
        fld.style.background = 'White';
    }
    return error;
}
function validatePhone(fld) 
{
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');    

    if (fld.value == "") 
    {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'Red';
    } 
    else if (isNaN(parseInt(stripped))) 
    {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Red';
    } 
    else if (!(stripped.length == 10)) 
    {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Red';
    }
    else 
    {
        fld.style.background = 'White';
    }
    return error;
}