function IsNumeric(strValue)
{
	//if the value is null the return false
	if (!strValue)
		return false;
		
	//check every digit in strValue to make sure it is numeric
	for (i = 0; i < strValue.length; i++) {
		if (strValue.charAt(i) < "0" || strValue.charAt(i) > "9") {
			return false;
		}
	}

	return true;
}

function Trim(strText) { 
    
    var strWork = new String();
    
    for (i = 0; i < strText.length; i++) {
		if (strText.charCodeAt(i) != 10 
			&& strText.charCodeAt(i) != 13) {
			
			strWork += strText.charAt(i);	
		} 
    }

    // this will get rid of leading spaces 
    while (strWork.substring(0,1) == ' ') 
        strWork = strWork.substring(1, strWork.length);

    // this will get rid of trailing spaces 
    while (strWork.substring(strWork.length-1,strWork.length) == ' ')
        strWork = strWork.substring(0, strWork.length-1);

   return strWork;
} 

function ReplaceChar(strSource, strReplaceChar, strReplaceWith)
{
	var strTemp = "";
	
	if (strSource == "")
		return strSource;
	
	for (i = 0; i < strSource.length; i++) {
		strTemp += strSource.charAt(i) == strReplaceChar ? strReplaceWith : strSource.charAt(i);
	}

	return strTemp;
}

function IsDate(strDate)
{
	return !(isNaN(Date.parse(strDate)));
}

function getAge(dateString) 
{
	var arrDate = dateString.split("/");
	
	if (arrDate.length != 3) {
		return "";	
	}
	
	var iMonth = arrDate[0] - 1;
	var iDay   = arrDate[1];
	var iYear  = arrDate[2];

	if (!IsNumeric(iMonth) || !IsNumeric(iDay) || !IsNumeric(iYear)) {
		return "";
	}

    var now = new Date();
    var today = new Date(now.getFullYear(),now.getMonth(),now.getDate());
    var yearNow = now.getFullYear();
    var monthNow = now.getMonth();
    var dateNow = now.getDate();

    var dob = new Date(iYear, iMonth, iDay);
    
    if (isNaN(dob))
		return "";
		
    var yearDob = dob.getFullYear();
    var monthDob = dob.getMonth();
    var dateDob = dob.getDate();

    yearAge = yearNow - yearDob;

    if (monthNow >= monthDob) {
        var monthAge = monthNow - monthDob;
    }
    else {
        yearAge--;
        var monthAge = 12 + monthNow -monthDob;
    }

    if (dateNow >= dateDob) {
        var dateAge = dateNow - dateDob;
    }
    else {
        monthAge--;
        var dateAge = 31 + dateNow - dateDob;

        if (monthAge < 0) {
            monthAge = 11;
            yearAge--; 
        }
    }

    return yearAge;
}

function ShowRecentTransactions(ar) 
{
      //shows the Recent Transactions dialog box and allows the user to optionally reverse transactions
      //ar indicates whether viewing recent ADD transactions (1) or recent REMOVE transactions (0)
      
      var strDlgRet = showModalDialog('recent_transactions.asp?ar=' + ar, null, "dialogHeight: 490px; dialogWidth: 770px; resizable: yes;  status: yes; help: no");
      
      while (typeof(strDlgRet) != "undefined") {
            var strPrevRetVal = strDlgRet;
            strDlgRet = showModalDialog('recent_transactions.asp?ar=' + ar + '&' + strPrevRetVal, null, "dialogHeight: 490px; dialogWidth: 770px;  resizable: yes; status: yes; help: no");
      }
}


function StripChars(str)
{
	//strips all of the alphabetic characters from a string, 
	//and returns the resulting digits (0-9) contained within the string, 
	//or an empty string
	
	var strRet = "";
	
	//if the value is null the return empty string
	if (!str)
		return strRet;

	//check every character in str to see if it is numeric
	for (i = 0; i < str.length; i++) {
		if (str.charAt(i) >= '0' && str.charAt(i) <= '9') {
			strRet += str.charAt(i);
		}
	}
	
	return strRet;
	
}


function NumDigits(strValue)
{
	//returns the number of digits (numbers) found in a string
	var iDigitCount = 0;
	
	//if the value is null the return false
	if (!strValue)
		return iDigitCount;

	//check every digit in strValue to see if it is numeric
	for (i = 0; i < strValue.length; i++) {
		if (strValue.charAt(i) >= '0' && strValue.charAt(i) <= '9') {
			iDigitCount++;
		}
	}

	return iDigitCount;
}

function IsValidPhoneNumber(strPhone)
{
	//determines whether a string is a valid phone number (contains 9 or 10 digits)
	var iNumDigits = NumDigits(strPhone);
	
	if (iNumDigits != 10 && iNumDigits != 11) {
		//alert("invalid phone number!");
		return false;
	}
	else {
		
		//if there are ten digits, return true
		if (iNumDigits == 10) {
			return true;
		}
		else { //if there are eleven digits, check to be sure first number is 1
			var strNoChars = StripChars(strPhone);
			
			if (strNoChars.charAt(0) == '1') {
				return true;
			}
			else {
				return false;
			}
		}
	}
	
	return true;
}

function ValidateExpirationDate(strDate)
{
	if (!IsDate(strDate) && strDate != '') {
	
		//check to see whether strDate may have been passed in as MM/YYYY (if so, use 1 as the day)
		var strMonth, strDay, strYear;
		var arrDate = strDate.split("/");
		
		//if the length of the array is 2, assume that the 
		//second element is the year, and insert a "1" for the day.
		if (arrDate.length == 2) {
			strMonth = arrDate[0];
			strDay = 1;
			strYear = arrDate[1];

			if (!IsNumeric(strMonth) || !IsNumeric(strYear))
				return false;
				
			strDate = strMonth + "/" + strDay + "/" + strYear;
		}

		if (!IsDate(strDate)) {
			return false;
		}
	}

	var dt = new Date(Date.parse(strDate));
	var dtNow = new Date();

	var iYear = dt.getFullYear();
	var iCurrentYear = dtNow.getFullYear();
	
	if ((iYear < iCurrentYear - 5) || (iYear > iCurrentYear + 20)) {
		return false;
	}

	return true;
}

function FormatPhoneNumber(strPhone)
{
	var strRet = "";
	
	if (!IsValidPhoneNumber(strPhone)) {
		return strRet;
	}

	var strNewPhone = StripChars(strPhone);
	
	if (strNewPhone.length == 10) {
		strRet = "(";
		strRet += strNewPhone.substr(0, 3).toString();
		strRet += ") ";
		strRet += strNewPhone.substr(3, 3).toString();
		strRet += "-";
		strRet += strNewPhone.substr(6, 4).toString();
	}
	else if (strNewPhone.length == 11) {
		strRet = "(";
		strRet += strNewPhone.substr(1, 3).toString();
		strRet += ") ";
		strRet += strNewPhone.substr(4, 3).toString();
		strRet += "-";
		strRet += strNewPhone.substr(7, 4).toString();
	}

	return strRet;
}

function IsValidCurrency(currencyVal) {

    currencyVal = currencyVal.replace(/\s/g, ""); //remove whitespace

    if (currencyVal == "") {
         return false;
    }

	return (currencyVal.search(/^\$?\d{0,3}(,?\d{3})*(\.\d{1,2})?$/) != -1)
}

function Left(str, n){
	if (n <= 0)
	    return "";
	else if (n > String(str).length)
	    return str;
	else
	    return String(str).substring(0,n);
}

function Right(str, n){
    if (n <= 0)
       return "";
    else if (n > String(str).length)
       return str;
    else {
       var iLen = String(str).length;
       return String(str).substring(iLen, iLen - n);
    }
}

function URLencode(sStr) 
{
    return escape(sStr).replace(/\+/g, '%2B').replace(/\"/g,'%22').replace(/\'/g, '%27');
}

function isValidDate(dateStr) {

    var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
    var matchArray = dateStr.match(datePat); // is the format ok?

    if (matchArray == null) {
    alert("Please enter date as mm/dd/yyyy");
    return false;
    }

    month = matchArray[1]; // p@rse date into variables
    day = matchArray[3];
    year = matchArray[5];

    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
}



function RequestData(linkId, cellElement, evt) 
{
        var evtSource;

        evt = (evt)? evt : window.event;
        evtSource = (evt.srcElement)? evt.srcElement : evt.target;

        //When a hyperlink is clicked, Safari returns the text node as the source element rather
        //than the hyperlink. parentNode will give us the hyperlink element.
        //ref: http://developer.apple.com/internet/webcontent/eventmodels.html

        if (evt.target) 
        {
            if (evt.target.nodeType == 3) 
            {
                evtSource = evtSource.parentNode;
            }
        }

        //If event was raised from an element other than the LinkButton
        if ((evtSource.getAttribute("id") != linkId) && (evt.type == "click")) 
        {
            //Get a collection of "a" tags inside the cell        
            var linkCollection = cellElement.getElementsByTagName("a");
            
            for (var i = 0; i < linkCollection.length; i++) 
            {
               //If the link button has an onclick attribute, call the onclick.
               //The onclick attribute is present when the GridView is using callback
               //example: onclick="java script:__gvGridSort1_GridView1.callback(...); return false;"
               var onClickAttribute = linkCollection[i].getAttribute("onclick");

               if (onClickAttribute != null) 
               {
                linkCollection[i].onclick();
                break;
               }

               //If the link button has a href attribute, set the location of the page
               //to the href value.
               //The href attribute is used when the GridView is not using callbacks
               //example: href="java script:__doPostBack('GridSort1$GridView1','Sort$UnitsOnOrder')" 

               var hrefAttribute = linkCollection[i].getAttribute("href");
               this.location.href = hrefAttribute;
               break;
            }
        }
    }