function checkForm(theForm){
	var reason = "";
	
	
	var txtCompany = theForm.company;
	var inSubmit = document.getElementById('submit');
	var txtFName = document.getElementById('firstname');
	var txtLName = document.getElementById('lastname');
	var txtAddress = document.getElementById('address');
	var txtTel = document.getElementById('tel');
	var txtEmail = document.getElementById('email');
	var txtUsername = document.getElementById('un');
	var txtPWord = document.getElementById('password1');
	var txtPWord2 = document.getElementById('password2');
	
	
	
	reason += validateEmpty(txtCompany);
	reason += validateEmpty(txtFName);
	reason += validateEmpty(txtLName);
	reason += validateEmpty(txtAddress);
	reason += validateEmpty(txtTel);
	reason += validateEmail(txtEmail);
	reason += validateUName(txtUsername);
	reason += validatePWord(txtPWord);

	
	if (reason != "") {
		alert("Some fields need correction:\n" + reason);
		
		return false;
		
	}
	else if (txtPWord.value != txtPWord2.value){
		alert("Password does not match");
		txtPWord.style.background = 'Yellow';
		txtPWord2.style.background = 'Yellow';
		
		return false;
	}	
	
	return true;
	
		
}

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

	return error;
}

function validateUName(fld) {
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a username.\n";
    } else if ((fld.value.length < 5) || (fld.value.length > 15)) {
        fld.style.background = 'Yellow'; 
        error = "The username is the wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The username contains illegal characters.\n";
    } else {
	    
        fld.style.background = 'White';
    } 
  
    return error;
}

function validatePWord(fld) {
    var error = "";
    var illegalChars = /[\W_]/; // allow only letters and numbers 
 
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter a password.\n";
    } else if ((fld.value.length < 7) || (fld.value.length > 15)) {
        error = "The password is the wrong length. \n";
        fld.style.background = 'Yellow';
    } else if (illegalChars.test(fld.value)) {
        error = "The password contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } else if (!((fld.value.search(/(a-z)+/)) && (fld.value.search(/(0-9)+/)))) {
        error = "The password must contain at least one numeral.\n";
        fld.style.background = 'Yellow';
    } 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 = '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;
}