function validateForm(){
	var validName = "";
	var validEmail = "";
	var validPostcode = "";
	var postbackForm = false;
	
	var nameVal = trimAll(document.getElementById('txtname').value);
	var emailVal = trimAll(document.getElementById('txtemail').value);
	var postcodeVal = trimAll(document.getElementById('txtpostcode').value);
	
	if(nameVal == ""){
		validName = "  - Name must not be empty \n"; }
	
	var emailReg =  /^(?:\w+\.?)*\w+@(?:\w+\.?)*\w+$/;
	if(emailVal == ""){
		validEmail = "  - Email must not be empty \n"; }
	else if(!emailVal.match(emailReg)){
	  validEmail = "  - Accepted Email format i.e.: bob@got2getaway.com \n"; }
	
	if(postcodeVal == ""){
		validPostcode = "  - Post code must not be empty."; }
	else if(isNaN(parseInt(postcodeVal))){
		validPostcode = "  - Post code must be digit."; }
	
	if(validName != "" || validEmail != "" || validPostcode != ""){
	  var errMsg = "Filled information error:\n" + validName + validEmail + validPostcode;
		alert(errMsg);}
	else{
	  postbackForm = true;}
		
	return postbackForm;
}

function trimAll(sString){
	while (sString.substring(0,1) == ' '){
		sString = sString.substring(1, sString.length);
	}
	while (sString.substring(sString.length-1, sString.length) == ' '){
		sString = sString.substring(0,sString.length-1);
	}
	return sString;
}