function checkRequired(form_name) {
	
	failed = false;
	
	if (document.forms[form_name].required.value) {
		reqArray = document.forms[form_name].required.value.split(",");

		for (a = 0; a < reqArray.length; a++) {
			if(document.forms[form_name].elements[reqArray[a]].value == "") {
				document.forms[form_name].elements[reqArray[a]].className = "textfield-required";
				if (!failed) { document.forms[form_name].elements[reqArray[a]].focus(); }
				failed = true;
			} else {
				document.forms[form_name].elements[reqArray[a]].className = "textfield";
			}
		}

		if (failed) {
			alert("One or more required fields were not filled in. Please fill in all the required fields before submitting.\nThe required fields are highlighted.");
			return false
		}
	}

	return true;
}

function checkEmail(str) {
	var emailFilter=/^.+@.+\..{2,3}$/;
	if (!(emailFilter.test(str))) { return false; }

	var illegalChars= /[\(\)<>,;:\\\/"\[\]]/;
	if (str.match(illegalChars)) { return false; }

	return true;
}

function checkValidNick(str) {
	var legalChars = /^[-a-z _]+$/i;
	if (str.match(legalChars)) { return true; } else { return false; }
}

function checkValidDate(str) {
	var regexp = /^\d{4}\-\d{2}-\d{2} \d{2}:\d{2}:?\d{0,2}$/;
	if (!(regexp.test(str))) { return false; } else { return true; }
}

function check() {
	if (!checkEmail(document.forms["LitReq"].elements["Email"].value)) {
		alert("Please enter a valid e-mail address.")
		return false;
	}

	if (document.forms["LitReq"].elements["Salutation"].value == "") {
		alert("Please enter your Salutation.");
		return false;
	}
	if (document.forms["LitReq"].elements["First Name"].value == "") {
		alert("Please enter your First Name.");
		return false;
	}
	if (document.forms["LitReq"].elements["Surname"].value == "") {
		alert("Please enter your Surname.");
		return false;
	}
	if (document.forms["LitReq"].elements["Address 1"].value == "") {
		alert("Please enter your Address.");
		return false;
	}
	if (document.forms["LitReq"].elements["Postcode"].value == "") {
		alert("Please enter your Postcode.");
		return false;
	}
	
	if(!checkBoxes())	{
		alert("Please order at least one item.");
		return false;
	}
	return true;
}

function checkBoxes(){
	var checkIDs = new Array;
	var allInputs = document.getElementsByTagName("input");
	for (i in allInputs){
		if (allInputs[i].className == "literature"){
			checkIDs.push(allInputs[i])
		}
	}
	var checked = false
	for (i=0;i<checkIDs.length;i++){ 
		if(checkIDs[i].checked){ 
			checked = true 
		}
	}
	return checked;
}