function validateFormOnSubmit(theForm) {
var reason = "";

  reason += validateName(theForm.name);
  reason += validateNumber(theForm.number);
      
  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  }

  return true;
}

function validateEmpty(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'url(/images/textbox-bg-err.jpg)'; 
        error = "The required field has not been filled in.\n"
    } else {
        fld.style.background = 'url(images/textbox-bg.jpg)';
    }
    return error;  
}
function validateName(fld) {
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'url(/images/textbox-bg-err.jpg)'; 
        error = "You didn't enter your name.\n";
	} else if (fld.value == "Full Name") {
        fld.style.background = 'url(/images/textbox-bg-err.jpg)'; 
        error = "Please enter your name.\n";
    } else if ((fld.value.length < 5) || (fld.value.length > 45)) {
        fld.style.background = 'url(/images/textbox-bg-err.jpg)'; 
        error = "Please enter your full name.\n";
    } else {
        fld.style.background = 'url(/images/textbox-bg.jpg)';
    }
    return error;
}
function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
}
function validateNumber(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');    

   if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'url(/images/textbox-bg-err.jpg)';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains incorrect characters.\n";
        fld.style.background = 'url(/images/textbox-bg-err.jpg)';
    } else if ((fld.value.length < 10) || (fld.value.length > 11)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'url(/images/textbox-bg-err.jpg)';
    } else {
        fld.style.background = 'url(/images/textbox-bg.jpg)';
		}
    return error;
}