function trim(s)

{

  return s.replace(/^\s+|\s+$/, '');

}





function validateEmpty(fld, name) {

    var error = "";

		var fldName = name != null ? name : fld.id;

  

    if (fld.value.length == 0) {

        fld.style.background = 'Yellow'; 

        error = "You didn't enter a " + fldName + ".\n"

    } else {

        fld.style.background = 'White';

    }

    return error;

}





function validateEmail(fld) {

    var error="";

    var tfld = trim(fld.value);

    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;

    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;

    

    if (fld.value == "") {

        fld.style.background = 'Yellow';

        error = "You didn't enter an email address.\n";

    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters

        fld.style.background = 'Yellow';

        error = "Please enter a valid email address.\n";

    } else if (fld.value.match(illegalChars)) {

        fld.style.background = 'Yellow';

        error = "The email address contains illegal characters.\n";

    } else {

        fld.style.background = 'White';

    }

    return error;

}



function validatePostalCode(fld) {

    var error="";

    var tfld = trim(fld.value);

    var zipFilter = /^\w*(?=\w{7})(?=\w*\d)(?=\w*[a-zA-Z])\w*$/ ;

    

    if (fld.value == "") {

        fld.style.background = 'Yellow';

        error = "You didn't enter a Postal Code.\n";

    } else if (!zipFilter.test(tfld)) {              //test postal code for valid format

        fld.style.background = 'Yellow';

        error = "Please enter a valid Postal Code.\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 = 'Yellow';

    } else if (isNaN(parseInt(stripped))) {

        error = "The phone number contains illegal characters.\n";

        fld.style.background = 'Yellow';

    } else if (!(stripped.length == 10)) {

        error = "The phone number is the wrong length. Make sure you included an area code.\n";

        fld.style.background = 'Yellow';

    } 

    return error;

}