// JavaScript Document
function emailCheck (emailStr) 
{
	
	var checkTLD=1;
	
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	
	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 + "|" + quotedUser + ")";
	
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	
	var matchArray=emailStr.match(emailPat);
	
	if (matchArray==null)
	{
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];

	for (i=0; i<user.length; i++) 
	{
		if (user.charCodeAt(i)>127) 
		{
			alert("Ths username contains invalid characters.");
			return false;
		}
	}
	for (i=0; i<domain.length; i++) 
	{
		if (domain.charCodeAt(i)>127) 
		{
			alert("Ths domain name contains invalid characters.");
			return false;
		}
	}
	
	if (user.match(userPat)==null)
	{
		// user is not valid
		alert("The username doesn't seem to be valid.");
		return false;
	}
	
	/* if the e-mail address is at an IP address (as opposed to a symbolic
	host name) make sure the IP address is valid. */
	
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) 
	{
		
		// this is an IP address
		
		for (var i=1;i<=4;i++) 
		{
			if (IPArray[i]>255) 
			{
				alert("Destination IP address is invalid!");
				return false;
			}
		}
		return true;
	}
	
	// Domain is symbolic name.  Check if it's valid.
	 
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) 
	{
		if (domArr[i].search(atomPat)==-1) 
		{
			alert("The domain name does not seem to be valid.");
			return false;
		}
	}
	
	if (checkTLD && domArr[domArr.length-1].length!=2 && 
	domArr[domArr.length-1].search(knownDomsPat)==-1) 
	{
		alert("The address must end in a well-known domain or two letter " + "country.");
		return false;
	}
	
	// Make sure there's a host name preceding the domain.
	
	if (len<2) 
	{
		alert("This address is missing a hostname!");
		return false;
	}
	
	// If we've gotten this far, everything's valid!
	return true;
}


function validate_required()
{
	var formElements = Array('FirstName','Surname','Organisation','EmailAddress','Telephone');
	
	/* check all required fields have been filled in */
	for ( var i in formElements )
	{
	/* || obj.id ==  "" */
		var obj = document.getElementById(formElements[i]);
		if ( obj.id == "Most_Interested_In" && ( obj.value == "" || obj.value == "__other"  ) )
		{
			if ( document.getElementById('MostInterstedOther').value == "" )
			{
				alert("Please make sure that the "+formElements[i]+" field has been filled in");
				return false;
			}
		}
		else if ( obj.id == "Looking_To_Purchase_As" && ( obj.value == "" || obj.value == "__other"  ) )
		{
			if ( document.getElementById('LookingtoPurchaseOther').value == "" )
			{
				alert("Please make sure that the "+formElements[i]+" field has been filled in");
				return false;
			}
		}
		else if ( obj.value == "" )
		{
			alert("Please make sure that the "+formElements[i]+" field has been filled in");
			return false;
		}
	}
	
	/* check email address is valid */
	var obj = document.getElementById('EmailAddress');
	if ( emailCheck(obj.value) == false )
	{
		return false;
	}
	
	/* check phone number is valid */
	var obj = document.getElementById('Area_Code');
	var obj2 = document.getElementById('Telephone');
	if ( obj.value.length != 2 )
	{
		alert("Please make sure that your area code has 2 digits. \nE.g. 08");
		return false;
	}
	if ( obj2.value.length != 8 )
	{
		alert("Please make sure that your phone has 8 digits with no dashes and/or spaces. \nE.g. 81234567");
		return false;
	}
	
	
	return true;
}