function IsEmptyField( oField, sAlert )
{
	var sValue;
	var bObject;
	
	if (typeof oField == "string") 
	{
		sValue = oField;
		bObject = false;
	}
	else if (typeof oField == "object")
	{
		sValue = oField.value;
		bObject = true;
	}
	else 
	{
		return false;
	}
	
	for (var i=0; i<sValue.length; i++) 
	{
		if (sValue.charAt(i) != " ") 
		{
			return false;
		}
	}
	
	if (sAlert != '' ) 
	{
		alert(sAlert);
		if( bObject ) 
		{
			oField.focus();
		}
	}	
	return true;
}

function checkMail(str)
{
	
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(str))
		return true;
	else
		return false;
}


function IsNumeric(str)
{
	var RefStr = "0123456789.";
	var RefDot =".";
	var tempChar;
	var countDot=0;
	
	for (var i=0; i<str.length; i++) 
	{
		tempChar = str.charAt(i);
			
		if (RefStr.indexOf(tempChar) == -1) 
		{
			return false;
		}
	}
	
	for (var i=0; i<str.length; i++) 
	{
		tempChar = str.charAt(i);
			
		if (RefDot.indexOf(tempChar) != -1) 
		{
			countDot++;
		}
	}
	
	if(countDot>1)
	{
		return false;
	}
	
	return true;
}

function IsInteger(str)
{
	var RefStr = "0123456789";
	var tempChar;
	for (var i=0; i<str.length; i++) 
	{
		tempChar = str.charAt(i);
			
		if (RefStr.indexOf(tempChar) == -1) 
		{
			return false;
		}
	}
	
	return true;
}

function Compare(val1, val2)
{
	if ( val1 == val2 )
		return 0;
	else if ( val1 < val2 )
		return -1;
	else
		return 1;			
}

function DisableEnter()
{
	if (window.event.keyCode == 13)
	{
		window.event.keyCode = 0;
	}
}

function isValidDate(dateStr) {
// Checks for the following valid date formats:
// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
// Also separates date into month, day, and year variables

//var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;

// To require a 4 digit year entry, use this line instead:
 var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

var matchArray = dateStr.match(datePat); // is the format ok?
if (matchArray == null) {
                        alert("Date is not in a valid format.")
                        return false;
                        }
month = matchArray[1]; // parse date into variables
day = matchArray[3];
year = matchArray[4];
if (month < 1 || month > 12) { // check month range
alert("Month must be between 1 and 12.");
return false;
}
if (day < 1 || day > 31) {
alert("Day must be between 1 and 31.");
return false;
}
if ((month==4 || month==6 || month==9 || month==11) && day==31) {
alert("Month "+month+" doesn't have 31 days!")
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)) {
alert("February " + year + " doesn't have " + day + " days!");
return false;
   }
}
return true;  // date is valid
}