function IsHttp(StrValue, strMsg)
{

	var reg_exp1 = new RegExp("http://")
	var reg_exp2 = new RegExp("https://")
	var reg_exp3 = new RegExp("ftp://")

	if ((StrValue.search(reg_exp1) != 0) && (StrValue.search(reg_exp2) != 0) && (StrValue.search(reg_exp3) != 0))
	{ 
		if (fCheck)
		{                     
			alert(strMsg)
			fCheck = false
		}
	}
}


function testUrl(which_field)
{
	fCheck = true
	// Which_field is compiled on the page as this.form.field_name
	ValueCheck(which_field.value, "", "You must first enter a url to test");
	IsHttp(which_field.value, "Your url must be prefixed by one of the following protocols in order to link correctly\n\nA. 'http://'\nB. 'https://'\nC. 'ftp://'");

	if (fCheck)
	{
		window.open(which_field.value , "displaywindow", "width=400,height=300,toolbar=no,scrollbars=yes,resizable=yes,menubar=no,status=no,directories=no,location=yes");
	}
}


function PhoneNumCheck(strFieldValue, FieldName)
{

	var PhonePat1 = /\d{2}\s\d{4}\s\d{4}/ 		// XX XXXX XXXX
	var PhonePat2 = /\d{4}\s\d{3}\s\d{3}/ 		// XXXX XXX XXX
	var PhonePat3 = /\d{2}\s\d{2}\s\d{2}/		// XX XX XX

	// if (str is blank or ((is 12 digit matching XX XXXX XXXX) OR (is 12 digit matching XXXX XXX XXX) OR (is 8 digit matching XX XX XX)))

	if ((strFieldValue == "") || ((strFieldValue.search(PhonePat1) == 0) && (strFieldValue.length == 12)) || ((strFieldValue.search(PhonePat2) == 0) && (strFieldValue.length == 12)) || ((strFieldValue.search(PhonePat3) == 0) && (strFieldValue.length == 8)))
	{    
		return
	} else {                  
		if (fCheck)
		{
			alert(FieldName + " must: \n\nA. contain numbers and spaces only\nB. conform to one of the following patterns:\n\n1. 00 0000 0000\n2. 0000 000 000\n3. 000 000")
			fCheck = false
		}
	}
}


function EmailCheck(emailStr) {

if ((fCheck != false) && (emailStr !="")) {
	fCheck = false

	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\ncheck that it contains one '@' and at least one full stop character")
		return false
	}

	var user 	= matchArray[1]
	var domain 	= matchArray[2]
	if (user.match(userPat)==null) {
	// user is not valid
	    alert("email address seems incorrect\nthe username portion doesn't seem to be valid")
	    return false
	}

	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("email address seems incorrect\ndestination IP address is invalid")
			return false
		    }
	    }
	    return true
	}

	var domainArray = domain.match(domainPat)
	if (domainArray==null) {
		alert("email address seems incorrect\nThe 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) {
	   // the address must end in a two letter or three letter word.
	   alert("The address must end in a three letter domain, or two letter country code")
	   return false
	}

	if (len<2) {
	   alert("This address appears to be missing a hostname")
	   return false
	}

	fCheck = true
	return true;
	}
}

function Validate_date(date_field)
{
	if (fCheck){

		var my_arr 		= date_field.split("/");
		var format_msg 	= "\n\ndates must be in the format DD/MM/YYYY"

		if (my_arr.length != 3){
			if (my_arr.length == 1){
				alert("the date string provided did not contain any slashes [/] which are used to seperate day/month/year values\nthe date was unable to be validated");
			} else {
				alert("the date string provided contained " + (my_arr.length - 1) + " slashes [/] instead of 2\nthe date was unable to be validated");
			}
			fCheck = false;
			return;
		} 

		// CONFIRM THAT PROVIDED VALUES ARE ALL INTEGERS
		for(var m = 0; m < my_arr.length; m++){
			if (isNaN(my_arr[m])){
				alert("the date string must contain only numbers, please change '" + my_arr[m] + "'");
				fCheck = false;
				return;
			}
		}

		// initialise
		this_day	= my_arr[0];
		this_month	= my_arr[1];
		this_year	= my_arr[2];

		month_arr 	= ['JAN','FEB','MAR','APR','MAY','JUN','JUL','AUG','SEP','OCT','NOV','DEC']

		if (this_year.length != 4){
			alert("please enter a four digit year" + format_msg);
			fCheck = false;
			return;
		}

		if (this_month > 12 || this_month < 1){
			alert("there can only be 12 months in a year, please use a number from 1 - 12" + format_msg);
			fCheck = false;
			return;
		}

		if (this_day < 1){
			alert("the day value must be a number greater than 0" + format_msg);
			fCheck = false;
			return;
		}

		if (this_month == 2){
			if (this_year % 4 == 0 && (this_year % 100 != 0 || this_year % 400 == 0)){
				if (this_day > 29){
					alert("there can only be 29 days in " + month_arr[this_month-1] + " on a leap year");
					fCheck = false;
					return;
				}
			} else {
				if (this_day > 28){
					alert("there can only be 28 days in " + month_arr[this_month-1]);
					fCheck = false;
					return;
				}
			}	
		}

		if ( ( (this_month == 4) || (this_month == 6) || (this_month == 9) || (this_month == 11) ) && (this_day > 30) ) {
			alert("there can only be 30 days in " + month_arr[this_month-1]);
			fCheck = false;
			return;
		}

		if (this_day > 31){
			alert("there can not be more that 31 days in " + month_arr[this_month-1]);
			fCheck = false;
			return;
		}		
	}

}

function Validate_datediff(start_date_name, start_date_value, end_date_name, end_date_value, error_msg){

	Validate_date(start_date_value);
	Validate_date(end_date_value);

	if (fCheck) {

		var start_arr 		= start_date_value.split("/");
		var end_arr 		= end_date_value.split("/");

		// initialise
		var is_error = 1
		var error_str = ""

		start_day		= parseInt(start_arr[0],10);
		start_month		= parseInt(start_arr[1],10);
		start_year		= parseInt(start_arr[2],10);

		end_day			= parseInt(end_arr[0],10);
		end_month		= parseInt(end_arr[1],10);
		end_year		= parseInt(end_arr[2],10);

		if (start_year > end_year){
			error_str = "year"
		} else {
			if ((start_month > end_month) && (start_year == end_year)){
				error_str = "month"
			} else {
				if ((start_day > end_day) && (start_month == end_month) && (start_year == end_year)){
					error_str = "day"
				} else {
					is_error = 0
				}
			}
		}
		if (is_error == 1){
			alert(error_msg + "the selected " + start_date_name + " (" + start_date_value + ") occurs after " + end_date_name + " (" + end_date_value + ")");
			//alert(error_msg + "the selected " + start_date_name + " (" + start_date_value + ") occurs after " + end_date_name + " (" + end_date_value + ") \nthe offending value is the " + error_str + " field");
			fCheck = false;
			return;
		}
	}
}


function CheckRanking(which_form, field_name, exclusion_str) {

	loop_count = 0
	fCheck = true

	with (window.document) {
		this_value = which_form.elements.length;
		final_array = new Array();

		for ( i=0; i < this_value; i++ ) {
			item_name = which_form.elements[i].name;

			if (item_name == field_name) {

				for(var m = 0; m < which_form.elements[i].options.length; m++){
					if(which_form.elements[i].options[m].selected){
						item_value = which_form.elements[i].options[m].value
						//	alert("item_value = " + item_value);
					}
				}

				tempstr = item_value;
				finalstr = tempstr.split("_");

				if (finalstr[1] != exclusion_str) {

					final_array[loop_count] = finalstr[1];

					for ( n=0; n < loop_count; n++) {
						if (fCheck){

							if (final_array[n] == finalstr[1]) {
								fCheck = false;
								alert("there is more than one item ranked in position " + finalstr[1] + "\nplease make sure that all rankings are unique and try again");
								//	alert("failed test\n" + final_array[n] + " = " + finalstr[1]);
							}
							//else {
								//	alert("passed test\n" + final_array[n] + " != " + finalstr[1]);
							//}
						}
					}
					loop_count++;

				} // finalstr[1] is not equal to the exclusion_str value [999]
			}
		}
	}
	if (fCheck) {
		which_form.submit()
	}
}

function NullCheck(StringValue, strMsg) {
	if ( Trim( StringValue) == '') {
			alert(strMsg);
			return false;
	}
	return true;
}

function LTrim(str) {

	var whitespace = new String(" \t\n\r");
	var s = new String(str);

	if (whitespace.indexOf(s.charAt(0)) != -1) {
		var j=0, i = s.length;
		while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
			j++;
		s = s.substring(j, i);
	}
	return s;
}

function RTrim(str) {
	var whitespace = new String(" \t\n\r");
	var s = new String(str);
	if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
		var i = s.length - 1;       // Get length of string
		while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
			i--;
		s = s.substring(0, i+1);
	}
	return s;
}

function Trim(str) {
	return RTrim(LTrim(str));
}

function AlphaNumCheck(fieldvalue,FieldMessage) {
	var valid = "0123456789abcdefghijklmnopqrstuvwxyz "
	var temp;
	var ok;
	ok = true;
	if (fCheck) {
		for (var i=0; i<fieldvalue.length; i++)  {
			temp = "" + fieldvalue.substring(i, i+1);
			 if (valid.indexOf(temp.toLowerCase()) == "-1") ok = false;
		   }
		if (ok == false)  {
			alert(FieldMessage);
			fCheck = false;
		}
	}
}

function NumCheck(fieldvalue,FieldMessage,obj,minVal,maxVal) 
{
	var valid = "0123456789."
	var temp;
	var ok;
	ok = true;

	for (var i=0; i<fieldvalue.length; i++)  
	{
		temp = "" + fieldvalue.substring(i, i+1);
		if (valid.indexOf(temp.toLowerCase()) == "-1") ok = false;
	}
	
	if (ok == false)  
	{
	   obj.focus();
	   alert(FieldMessage);				
	} else {
		if (minVal>0)
		{
			if (fieldvalue<minVal)
			{
					obj.focus();
				   alert(FieldMessage);				
				   ok=false;
			}
		}
		
		if (maxVal>0)
		{
			if (fieldvalue>maxVal)
			{
				obj.focus();
			   alert(FieldMessage);				
			   ok=false;
			}
		}
	}
}

function InvalidCharacterCheck(fieldValue, checkValue, fieldMessage)
{
	if (fieldValue.indexOf(checkValue) != -1)
	{
		if (fCheck)
		{                    
			alert(fieldMessage);
			fCheck = false;
		}
	}
}


function PhoneNumberCheck(StrValue, sErrorMsg)
{
	var ValidCharacters = "0123456789 ";
	var character;
	var bValid = true;

	for (var i=0; i<StrValue.length; i++)
	{
		character = StrValue.substring(i, i+1);
		
		if (ValidCharacters.indexOf(character) == "-1")
		{
			bValid = false;
		}
	}

	if (fCheck)
	{
		if (!bValid)
		{
			alert(sErrorMsg);
			fCheck = false;
		}
	}
}


function IsHttpExists(StrValue)
{
	var reg_exp1 = new RegExp("http://")
	var reg_exp2 = new RegExp("https://")
	var reg_exp3 = new RegExp("ftp://")

	if ((StrValue.search(reg_exp1) == -1) && (StrValue.search(reg_exp2) == -1) && (StrValue.search(reg_exp3) == -1))
	{
		bHttpStrExists = false
	} else {
		bHttpStrExists = true
	}
}


function CheckValidUrl(field)
{
	fCheck = true;
	bHttpStrExists = false;

	ValueCheck(field, "", "You must first enter a url to test");
	IsHttpExists(field);
	
	if (fCheck)
	{
		if (bHttpStrExists)
		{
			window.open(field, "displaywindow", "width=400,height=300,toolbar=no,scrollbars=yes,resizable=yes,menubar=no,status=no,directories=no,location=yes");
		} else {
			window.open("http://" + field, "displaywindow", "width=400,height=300,toolbar=no,scrollbars=yes,resizable=yes,menubar=no,status=no,directories=no,location=yes");
		}
	}
}


function CurrencyCheck(StrValue, sErrorMsg)
{
	var ValidCharacters = "0123456789.";
	var character;
	var decPointCount = 0;
	var bValid = true;

	for (var i=0; i<StrValue.length; i++)
	{
		character = StrValue.substring(i, i+1);

		if (character == ".")
		{
			decPointCount = decPointCount + 1
		}
		
		if (ValidCharacters.indexOf(character) == "-1")
		{
			bValid = false;
		}
	}

	if (bValid)
	{
		if (decPointCount == 0 || decPointCount == 1)
		{
			bValid = true;
		}else{
			bValid = false;
		}
	}
	
	if (fCheck)
	{
		if (!bValid)
		{
			alert(sErrorMsg);
			fCheck = false;
		}
	}
}

// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.
function isValidTime(timeStr, sErrorMsg) 
{
	var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?$/;
	var matchArray = timeStr.match(timePat);
	var bValid = true;

	if (matchArray == null) {
		bValid = false;
	}

	if (bValid) {
		hour = matchArray[1];
		minute = matchArray[2];
		second = matchArray[4];
		ampm = matchArray[6];

		alert(matchArray[2] + " " + ampm);

		if (second=="") { second = null; }
		if (ampm=="") { ampm = null }

		if (hour < 0  || hour > 23) {
			bValid = false;
		}
		if (minute<0 || minute > 59) {
			bValid = false;
		}
		if (second != null && (second < 0 || second > 59)) {
			bValid = false;
		}
	}

	if (fCheck)
	{
		if (!bValid)
		{
			alert(sErrorMsg);
			fCheck = false;
		}
	}
}