var IE = document.all;

function check_address() {
	if(document.register.txtTitle[3].checked) {
		if(document.register.txtOther.value == "") {
			alert("Please enter your title");
			document.register.txtOther.focus();
			return false;
		}
		else {
			document.register.txtTitle.value = document.register.txtOther.value;
			//alert(document.register.txtTitle.value);
		}
	}
	var ttl = false;
	for(i=0;i<4;++i) if (document.register.txtTitle[i].checked == true) ttl=true;
	if (ttl==false){ alert("Please enter your title"); document.register.title[0].focus(); return false; }

	if	(document.register.txtFirstName.value == "") { alert("Please enter your first name"); document.register.txtFirstName.focus(); return false; }
	if	(document.register.txtLastName.value == "") { alert("Please enter your last name"); document.register.txtLastName.focus(); return false; }

	if	(document.register.txtEmailAddress.value == "") { alert("Please enter your email address"); document.register.txtEmailAddress.focus(); return false; }
	X = new Number(String(document.register.txtEmailAddress.value).length);        
	if	(X < 5) { alert("The email address you have entered is too small \n\nPlease enter an email address longer than 5 characters."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	//if	(X > 30) { alert("The email address you have entered is too long \n\nPlease enter an email address smaller than 30 characters"); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	if	(document.register.txtEmailAddress.value.indexOf("@") == -1) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	if	(document.register.txtEmailAddress.value.indexOf (".") == -1) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	if	(document.register.txtEmailAddress.value.length  - (document.register.txtEmailAddress.value.lastIndexOf (".") + 1) > 3) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	if	(document.register.txtEmailAddress.value.indexOf ("_") != -1  && document.register.txtEmailAddress.value.lastIndexOf ("_") > document.register.txtEmailAddress.value.lastIndexOf ('@')) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	if	(document.register.txtEmailAddress.value.indexOf ("'") != -1) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	atCnt = 0;
	for     (i=0;i < document.register.txtEmailAddress.value.length;i++) if (document.register.txtEmailAddress.value.charAt(i) == "@") atCnt++;
	if	(atCnt > 1) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; }
	checkemailvalidity = 0;
	for     (i=0;i < document.register.txtEmailAddress.value.length;i++) if ((document.register.txtEmailAddress.value.charAt(i) < "0" || document.register.txtEmailAddress.value.charAt(i) > "9") && (document.register.txtEmailAddress.value.charAt(i).toLowerCase() < "a" || document.register.txtEmailAddress.value.charAt(i).toLowerCase() > "z") && document.register.txtEmailAddress.value.charAt(i) != "_" && document.register.txtEmailAddress.value.charAt(i) != "." && document.register.txtEmailAddress.value.charAt(i) != "@" && document.register.txtEmailAddress.value.charAt(i) != "-") checkemailvalidity = 1
	if      (checkemailvalidity == 1) { alert("Invalid email address entered.\n\nPlease enter a valid email address."); document.register.txtEmailAddress.value="";document.register.txtEmailAddress.focus(); return false; } 

//	if	(document.register.txtAddress.value == "") { alert("Please enter your address"); document.register.txtAddress.focus(); return false; }
//	if      (document.register.txtPostCode.value == "") { alert("Please enter your post code"); document.register.txtPostCode.focus(); return false; }
//	if	(document.register.txtTelephone.value == "") { alert("Please enter your telephone number"); document.register.txtTelephone.focus(); return false; }
//	NoNum = 0;
//	for     (i=0;i < document.register.txtTelephone.value.length;i++) if ((document.register.txtTelephone.value.charAt(i) < "0" || document.register.txtTelephone.value.charAt(i) > "9")&& document.register.txtTelephone.value.charAt(i) != " " && document.register.txtTelephone.value.charAt(i) != "(" && document.register.txtTelephone.value.charAt(i) != ")" && document.register.txtTelephone.value.charAt(i) != "-") NoNum = 1;
//	if	(NoNum == 1) { alert("Invalid telephone number entered.\n\nPlease enter a valid telephone number [ use 0-9 ( ) - ]."); document.register.txtTelephone.focus(); return false; }
}

function isValidDate(dateStr) 
{
var strErr=0;
var datename = new Date();
var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;
var matchArray = dateStr.match(datePat);
if (matchArray == null)
{
alert("Date is not in a valid format.")
strErr=1;
return false;
}
month = matchArray[3];
day = matchArray[1];
year = matchArray[4];
if (month < 1 || month > 12)
{
alert("Month must be between 1 and 12.");
strErr=1;
return false;
}
if (day < 1 || day > 31) 
{
alert("Day must be between 1 and 31.");
strErr=1;
return false;
}
if ((month==4 || month==6 || month==9 || month==11) && day==31) 
{
alert("Month "+month+" doesn't have 31 days!")
strErr=1;
return false
}
if (month == 2) 
{
var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
if (day>29 || (day==29 && !isleap)) 
{
alert("February " + year + " doesn't have " + day + " days!");
strErr=1;
return false;
}
}
return true;
}