function onlyNumbers(evt)
{
	var e = event || evt; // for trans-browser compatibility
	var charCode = e.which || e.keyCode;

	if (charCode > 31 && (charCode < 48 || charCode > 57))
		return false;

	return true;

}

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

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

  //alert("All fields are filled correctly");
  //return false;
}
function validateName(fld) {
    var error = "";
    var illegalChars = /\W /; // allow letters, numbers, spaces and underscores
 
    if (fld.value == "") {
        fld.style.background = '#E2E7EB'; 
        error = "You didn't enter a name.\n";
    } else if ((fld.value.length < 3) || (fld.value.length > 35)) {
        fld.style.background = '#E2E7EB'; 
        error = "The name is the wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = '#E2E7EB'; 
        error = "The name contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

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 = '#E2E7EB';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = '#E2E7EB';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = '#E2E7EB';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}