function validateForm(theForm) {
	var reason = "";
	
  	reason += validateEmpty(theForm.name);
 	reason += validateEmail(theForm.email);
  	reason += validatePhone(theForm.phone);
      
	if (reason != "") {
		alert(reason);
		return false;
	}
	
	return true;
}

function validateCheckBox(fld) {
	var error = "";
	
	if(fld.checked == 0) {
		error = "You must check the mentioned agreement in order to submit this form.\n";
	}
	
	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 = '#CCCCCC';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number entered is invalid.\n";
        fld.style.background = '#CCCCCC';
    } else if (stripped.length != 10) {
        error = "The phone number entered is invalid.\n";
        fld.style.background = '#CCCCCC';
    } 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 = '#CCCCCC';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = '#CCCCCC';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = '#CCCCCC';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

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