var focusSet=false;

function InvalidField(field)
{
	if (eval("document.forms[0]." + field + ".value") =="")
	{
		if (!focusSet)
			{
				focusSet = true;
				eval("document.forms[0]." + field + ".focus();")
			}
		return true;
		}
	else
		return false;
}

function onError(obj,error_message)
{
	obj.focus();
	alert(error_message);
	return false;	
}

function onErrorNoFocus(obj,error_message)
{
	alert(error_message);
	return false;	
}

function hasValue(obj, obj_type)
{
	if (obj_type == "TEXT" || obj_type == "PASSWORD")
	{
		if (obj.value.length == 0) 
	  		return false;
		else 
	  		return true;
	}
	else if (obj_type == "SELECT")
	{
		for (i=1; i < obj.length; i++)
		{
			if (obj.options[i].selected)
				return true;
		}
	   	return false;	
	}
	else if (obj_type == "SINGLE_VALUE_RADIO" || obj_type == "SINGLE_VALUE_CHECKBOX")
	{
		if (obj.checked)
			return true;
		else
	   		return false;	
	}
	else if (obj_type == "RADIO" || obj_type == "CHECKBOX")
	{
		for (i=0; i < obj.length; i++)
		{
			if (obj[i].checked)
				return true;
		}
	   	return false;	
	}
}


function checkdate(object_value)
{
	if (object_value.length == 0)
		return true;
	isplit = object_value.indexOf('/');
	if (isplit == -1 || isplit == object_value.length)
		return false;
	sMonth = object_value.substring(0, isplit);
	if (sMonth.length == 0)
		return false;
	isplit = object_value.indexOf('/', isplit + 1);
	if (isplit == -1 || (isplit + 1 ) == object_value.length)
		return false;
	sDay = object_value.substring((sMonth.length + 1), isplit);
	if (sDay.length == 0)
		return false;
	sYear = object_value.substring(isplit + 1);
	if (!checkinteger(sMonth))
		return false;
	else if (!checkrange(sMonth, 1, 12))
		return false;
	else if (!checkinteger(sYear))
		return false;
	else if (!checkrange(sYear, 0, 9999))
		return false;
	else if (!checkinteger(sDay))
		return false;
	else if (!checkday(sYear, sMonth, sDay))
		return false;
	else
		return true;
}

function checkday(checkYear, checkMonth, checkDay)
{
	maxDay = 31;
	if (checkMonth == 4 || checkMonth == 6 ||
		checkMonth == 9 || checkMonth == 11)
		maxDay = 30;
	else if (checkMonth == 2)
	{
		if (checkYear % 4 > 0)
			maxDay =28;
		else if (checkYear % 100 == 0 && checkYear % 400 > 0)
			maxDay = 28;
		else
			maxDay = 29;
	}
	return checkrange(checkDay, 1, maxDay);
}


function checkinteger(object_value)
{
	if (object_value.length == 0)
		return true;
	var decimal_format = ".";
	var check_char = object_value.indexOf(decimal_format);
	if (check_char == -1)
		return checknumber(object_value);
	else
		return false;
}


function numberrange(object_value, min_value, max_value)
{
	if (min_value != null)
	{
		if (object_value < min_value)
			return false;
	}
	if (max_value != null)
	{
		if (object_value > max_value)
			return false;
	}
	return true;
}


function checknumber(object_value)
{
	if (object_value.length == 0)
		return true;
	var start_format = " .+-0123456789";
	var number_format = " .0123456789";
	var check_char;
	var decimal = false;
	var trailing_blank = false;
	var digits = false;
	check_char = start_format.indexOf(object_value.charAt(0));
	if (check_char == 1)
		decimal = true;
	else if (check_char < 1)
		return false;
	for (var i = 1; i < object_value.length; i++)
	{
		check_char = number_format.indexOf(object_value.charAt(i));
		if (check_char < 0)
			return false;
		else if (check_char == 1)
		{
			if (decimal)
				return false;
			else
				decimal = true;
		}
		else if (check_char == 0)
		{
			if (decimal || digits)	
				trailing_blank = true;
		}
		else if (trailing_blank)
			return false;
		else
			digits = true;
	}	
	return true
}


function checkrange(object_value, min_value, max_value)
{
	if (object_value.length == 0)
		return true;
	if (!checknumber(object_value))
		return false;
	else
		return (numberrange((eval(object_value)), min_value, max_value));
	return true;
}


function checktime(object_value)
{
	if (object_value.length == 0)
		return true;
	isplit = object_value.indexOf(':');
	if (isplit == -1 || isplit == object_value.length)
		return false;
	sHour = object_value.substring(0, isplit);
	iminute = object_value.indexOf(':', isplit + 1);
	if (iminute == -1 || iminute == object_value.length)
		sMin = object_value.substring((sHour.length + 1));
	else
		sMin = object_value.substring((sHour.length + 1), iminute);
	if (!checkinteger(sHour))
		return false;
	else if (!checkrange(sHour, 0, 23))
		return false;
	if (!checkinteger(sMin))
		return false;
	else
	if (!checkrange(sMin, 0, 59))
		return false;
	if (iminute != -1)
	{
		sSec = object_value.substring(iminute + 1);

		if (!checkinteger(sSec))
			return false;
		else if (!checkrange(sSec, 0, 59))
			return false;	
	}
	return true;
}


function checkphone(object_value)
{
	if (object_value.length == 0)
		return true;
	if (object_value.length != 12)
		return false;
	if (!checknumber(object_value.substring(0,3)))
		return false;
	else if (!numberrange((eval(object_value.substring(0,3))), 100, 1000))
		return false;
	if (object_value.charAt(3) != "-" && object_value.charAt(3) != " ")
		return false
	if (!checknumber(object_value.substring(4,7)))
		return false;
	else if (!numberrange((eval(object_value.substring(4,7))), 100, 1000))
		return false;
	if (object_value.charAt(7) != "-" && object_value.charAt(7) != " ")
		return false;
	if (object_value.charAt(8) == "-" || object_value.charAt(8) == "+")
		return false;
	else
		return (checkinteger(object_value.substring(8,12)));
}


function checkzip(object_value)
{
	if (object_value.length == 0)
		return true;
	if (object_value.length != 5 && object_value.length != 10)
		return false;
	if (object_value.charAt(0) == "-" || object_value.charAt(0) == "+")
		return false;
	if (!checkinteger(object_value.substring(0,5)))
		return false;
	if (object_value.length == 5)
		return true;
	if (object_value.charAt(5) != "-" && object_value.charAt(5) != " ")
		return false;
	if (object_value.charAt(6) == "-" || object_value.charAt(6) == "+")
		return false;
	return (checkinteger(object_value.substring(6,10)));
}

function checkemail (EmailField) 
{
        var EmailStr = EmailField;
        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 adress error\nEmail address seems incorrect (check @ and .'s)")
        	return false
        }

        var user=matchArray[1]
        var domain=matchArray[2]
        if (user.match(userPat)==null) {
                alert("The username doesn't seem to be valid.")
                return false
        }
        
        var IPArray=domain.match(ipDomainPat)
        if (IPArray!=null) {
                for (var i=1;i<=4;i++) {
                        if (IPArray[i]>255) {
                	        alert("Email adress error\nDestination IP address is invalid!")
                		return false
                        }
                }
                return true
        }
        
        var domainArray=domain.match(domainPat)
        if (domainArray==null) {
	       alert("Email adress error\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) {
                alert("Email adress error\nThe address must end in a three-letter domain, or two letter country.")
                return false
        }
        
        return true;
}


function setFormParam( strFormName, strParamName, strParamValue )
{
	var strObjName = "document." + strFormName + "." + strParamName;
	var obj = eval( strObjName );
	obj.value = strParamValue;
	return true;
}


function checkregex(object_value, regex)
{
	return regex.test(object_value);
}