function openCal(month,year)
{
	window.open("calendar.php?month="+month+"&year="+year,"Cal","toolbar=no,status=no,menubar=no,scrollbars=no,resizable=yes,width=220,height=235");
}

function resetForm(idx)
{
	var formObj = document.forms[idx];
	for (var i=0; i<formObj.elements.length; i++)
	{
		var obj = formObj.elements[i];
		if (obj.type.indexOf("check")>-1) obj.checked=false;
		else if (obj.type.indexOf("text")>-1) obj.value="";
	}	
}

function checkrequired(idx,cc,win) 
{
	var pass=true; var email=true;
	if (document.images && document.forms[idx]) 
	{
		for (i=0;i<document.forms[idx].length;i++) 
		{
			var tempobj=document.forms[idx].elements[i];
			if (tempobj.name.indexOf("required_")==0) 
			{
				if (tempobj.value == "") { pass=false; break; }
				else if (tempobj.name.indexOf("email")>-1)
				{
					email = emailCheck(tempobj.value);
					if (!email) 
					{
						pass=false; 
						alert("This email address appears to be invalid. Please check it and enter the correct address.");
						tempobj.focus();
						break; 
					}
				}
				else if (tempobj.type.indexOf("s")>-1 && tempobj.selectedIndex==0) { 	pass=false; break;	}
			}
	    }
	}
	if (email && !pass) 
	{
		shortFieldName=tempobj.name.substring(9,30).toUpperCase();
		alert("Please make sure the "+shortFieldName+" field was properly completed.");
		tempobj.focus();
	}
	else if (pass && email && cc=="false")
	{	
		document.forms[idx].submit();  
	}
	else if (pass && email && cc=="true")
	{	
		validateCC(idx,win);
	}
}

function emailCheck (emailStr) {
	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) {
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	if (user.match(userPat)==null) {
	    return false
	}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		  for (var i=1;i<=4;i++) {
		    if (IPArray[i]>255) {
			return false
		    }
	    }
	    return true
	}
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
	    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) {
	   return false
	}
	if (len<2) {
	   return false
	}
	return true;
}

function validateCC(idx,win)
{
	var temp = document.forms[idx];
	var ccnum = temp.required_card_number;
	var ccpass = true; var card = false; var card_date = false;
	if (ccpass)
	{
		if (ccnum.value == "")
		{
			ccpass=false;
			alert("Please enter a credit card number.");
			temp.card_number.focus();
		}
		else var card = cardCheck(ccnum.value);
		if (ccpass && !card) 
		{
			ccpass=false;
			alert("You have entered an invalid credit card number. Please check the number and enter it again.");
			ccnum.focus();
		}
		// check the card expiry date
		var yeer = temp.exp_year.value;
		var month = temp.exp_month.value;
		card_date=dateCheck(yeer,month);
		if (ccpass && !card_date)
		{
			ccpass=false;
			alert("Your credit card appears to have expired. Please check your card and set the correct expiry date.");
		}
	}
	if (ccpass && card && card_date) document.forms[idx].submit();
}


function cardCheck(CardNumber)
{
	var no_digit = CardNumber.length;
	var oddoeven = no_digit & 1;
	var sum = 0;
	for (var count = 0; count < no_digit; count++) 
	{
		var digit = parseInt(CardNumber.charAt(count));
		if (!((count & 1) ^ oddoeven)) 
		{
			digit *= 2;  
			if (digit > 9) digit -= 9;
		}
		sum += digit;
	}
	if (sum % 10 == 0) return true;
	else
	// You can make this test live by removing the // on the next line and putting // on the one after.
	return false;
	//return true;
}	

function dateCheck(yeer,month)
{
	var today = new Date();
	var m = today.getMonth()+1;
	var yr = today.getFullYear();
	var year = "20" + yeer;
	if ((year == yr && month >= m) || year > yr ) 
		return true;
	else return false;	
}