function checkData(w) {

	if (w.name  && !validName(w.name.value, "Name"))
	{	w.name.focus();
		return false;
	}
	
	if (w.surname && !validName(w.surname.value, "Surname"))
	{	w.surname.focus();
		return false;
	}
	
		if (w.phone && !validNums(w.phone.value, "Phone"))
	{	w.phone.focus();
		return false;
	}
	
		if (w.date && !validNums(w.date.value, "Class Date"))
	{	w.date.focus();
		return false;
	}
	
		if (w.phone && !validNums(w.phone.value, "Phone No"))
	{	w.phone.focus();
		return false;
	}
	
		if (w.attend && !validNums(w.attend.value, "Number Attending"))
	{	w.attend.focus();
		return false;
	}
	
	if (w.address && !validAddress(w.address.value, "Address"))
	{	w.address.focus();
		return false;
	}
	
	if (w.suburb && !validName(w.suburb.value, "Suburb"))
	{	w.suburb.focus();
		return false;
	}	
	
		if (w.postcode && !validNums(w.postcode.value, "Postcode"))
	{	w.postcode.focus();
		return false;
	}	
	
	
	if (w.email && !validEmail(w.email.value, "Email"))
	{	w.email.focus();
		return false;
	}	
	
	if (w.confirmemail && !validEmail(w.confirmemail.value, "Confirm Email"))
	{	w.confirmemail.focus();
		return false;
	}	
	
	if (w.confirmemail.value != w.email.value)
	{	w.confirmemail.focus();
		alert("Emails do seem to match");
		return false;
	}

	if (
		w.state.selectedIndex == 0) 
	{	alert("Please Select A State");
		w.state.focus();
		return false;
	}	
	
	if (
		w.hear.selectedIndex.value == -1) 
	{	alert("Please Select How You Heard About Us");
		w.hear.focus();
		return false;
	}
	
	if (w.ns.checked == "") 		
	{	alert("Please Read Our Terms and Conditions");
		w.ns.focus();
		return false;
	}	
	
	/*if (
		w.ns0.checked == false && 
		w.ns1.checked == false && w.ns2.checked == false && w.ns3.checked == false && w.ns4.checked == false && w.ns5.checked == false && w.ns6.checked == false && w.ns7.checked == false && w.ns8.checked == false && w.ns9.checked == false && w.ns10.checked == false && w.ns11.checked == false && w.ns12.checked == false && w.ns13.checked == false&& w.ns14.checked == false && w.ns15.checked == false && w.ns16.checked == false && w.ns17.checked == false && w.ns18.checked == false && w.ns19.checked == false) 
	{	alert("Please Select Atleast One Procedure");
		w.ns.focus();
		return false;
	}	*/
	
			
}


function validName(n, t)
{	if (n == "")
	{	alert("Please enter your "+ t +".")
		return false;
	}
	else
	{	var Chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./- ";
		for (var i = 0; i < n.length; i++)
		{	if (Chars.indexOf(n.charAt(i)) == -1)
			{	alert ("Please enter a valid "+ t +".")
				return false
			}
		}
	}

	return true;
}

function validNums(n, t)
{	if (n == "")
	{	alert("Please enter a "+ t +".")
		return false;
	}
	else
	{	var Chars = "0123456789";
		for (var i = 0; i < n.length; i++)
		{	if (Chars.indexOf(n.charAt(i)) == -1)
			{	alert ("Please enter only numbers in "+ t +".")
				return false
			}
		}
	}
	
	return true;
}


function validEmail(e, t)
{	
	if (e == "")
	{
		alert("Please enter your "+t);
		return false;
	}
	var emailStr = e;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\*\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="([^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + specialChars + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null)
	{	alert("Your "+ t +" seems incorrect. Please check @ and .'s!");
		return false;
	}

	var user=matchArray[1];
	var domain=matchArray[2];
	if (user.match(userPat)==null)
	{	alert("Please do not use any symbols (ie. quotes or asterisks) other than @ in your "+ t +".");
		return false;
	}

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null)
	{  for (var i=1;i<=4;i++)
		  {	if (IPArray[i]>255)
			{	alert("Destination IP address is invalid!");
				return false;
			}
		}
	}

	var domainArray=domain.match(domainPat)
	if (domainArray==null)
	{	alert("Your "+ t +" domain name doesn't seem to be valid.");
		return false;
	}

	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>3)
	{	alert("Your "+ t +" must end in a three-letter domain, or two letter country.");
		return false;
	}

	var Chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	if (domArr[domArr.length-1].length == 2 || domArr[domArr.length-1].length == 3)
	{	for (var i = 0; i < domArr[domArr.length-1].length; i++)
		{	if (Chars.indexOf(domArr[domArr.length-1].charAt(i)) == -1)
			{	alert("The domain name can only contain letters.");
				return false;
			}
		}
	}

	if (len<2 || len>3)
	{	alert("Your "+ t +" is missing a hostname!");
		return false;
	}

	return true;
}

function validCompany(n, t)
{	if (n == "")
	{	alert("Please enter your "+ t +".")
		return false;
	}
	else
	{	var Chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ -";
		for (var i = 0; i < n.length; i++)
		{	if (Chars.indexOf(n.charAt(i)) == -1)
			{	alert ("Please enter a valid "+ t +".")
				return false
			}
		}
	}

	return true;
}

function validAddress(n, t)
{	if (n == "")
	{	alert("Please enter your "+ t +".")
		return false;
	}
	else
	{	var Chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ -";
		for (var i = 0; i < n.length; i++)
		{	if (Chars.indexOf(n.charAt(i)) == -1)
			{	alert ("Please enter a valid "+ t +".")
				return false
			}
		}
	}

	return true;
}

function validSuburb(n, t)
{	if (n == "")
	{	alert("Please enter your "+ t +".")
		return false;
	}
	else
	{	var Chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ -";
		for (var i = 0; i < n.length; i++)
		{	if (Chars.indexOf(n.charAt(i)) == -1)
			{	alert ("Please enter a valid "+ t +".")
				return false
			}
		}
	}

	return true;
}

function validCity(n, t)
{	if (n == "")
	{	alert("Please enter your "+ t +".")
		return false;
	}
	else
	{	var Chars = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ -";
		for (var i = 0; i < n.length; i++)
		{	if (Chars.indexOf(n.charAt(i)) == -1)
			{	alert ("Please enter a valid "+ t +".")
				return false
			}
		}
	}

	return true;
}


function validpost(z, t) {
	if (z == "")
	{	alert("Please fill in your "+ t +".");
		return false; 
	}
	else
	{	// check to see that the value contains at least 4 numbers
		if (z.length < 4)
		{	alert ("Please enter at least 4 numbers into the "+ t +" field.");
			return false;
		}
		// check to see that the value contains either 5 or 10 numbers
		if (z.length > 4 )
		{	alert ("Your post code must only contain 4 digits.");
			return false;
		}
		// check to see that the value contains only numbers
		var nums = "0123456789";
		for (var i = 0; i < z.length; i++)
		{	if (nums.indexOf(z.charAt(i)) == -1)
			{	alert ("Please enter only numbers into the "+ t +" field.");
				return false;
			}
		}
	}
	
	return true;
}