function radioChecked(field)
{
	result = false;
	for(i=0; i < field.length; i ++)
	{
		if(field[i].checked)
			result = true;
	}
	return result;
}


function radioValue(field)
{
	for(i=0; i < field.length; i ++)
	{
		if(field[i].checked)
			return field[i].value;
	}
}


function isNumber(field)
{
	if(isNaN(field.value))
	{
		alert("The Value of " + field.getAttribute("label") + " field is not a valid number\nPlease enter a number");
		field.focus();
		return false;
	}
	else
		return true;
}


var year,month,day; // these are global so that they can be used in isValidDate and isDateInPast
function isValidDate(dateStr)
{
// Checks for the following valid date formats:
// DD/MM/YYYY DD-MM-YYYY
// Also separates date into month, day, and year variables
	//var year,month,day; declared as globals now
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

	var matchArray = dateStr.match(datePat); // is the format ok?
	if (matchArray == null) 
	{
		return false;
	}
	month = matchArray[3]; // parse date into variables
	day = matchArray[1];
	year = matchArray[4];
	if (month < 1 || month > 12) 
	{ // check month range
		return false;
	}
	if (day < 1 || day > 31) 
	{
		return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) 
	{
		return false
	}
	if (month == 2) 
	{ // check for february 29th
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day>29 || (day==29 && !isleap)) 
		{
			return false;
		}
	}
	return true; // date is valid
}


function isDateInPast(){
	var now = new Date();
	var today = new Date(now.getFullYear(),now.getMonth(),now.getDate());
	fldDate = new Date(year,month-1,day);
	if (fldDate<today)
		return true;
	else
		return false;
}


function swapImg(sImgName,sImgSrc)
{
  document.images[sImgName].src = sImgSrc;
}


function showItem(id)
{
	document.getElementById(id).style.display="";
}

function hideItem(id)
{
	document.getElementById(id).style.display="none";
}


function EnforceMaxLength(obj, mlength)
{
	if (obj.value.length > mlength)
	{
		obj.value = obj.value.substring(0,mlength);
		alert ("This field only allows " + mlength + " characters");
	}	
}