function dateDiff(firstdate,firsttime,seconddate,secondtime,typediff) {
//typediff: "weeks", "days", "hours", "minutes","seconds"	

	date1 = new Date();
	date2 = new Date();
	diff  = new Date();
	
	if (isValidDate(firstdate) && isValidTime(firsttime)) { // Validates first date 
	date1temp = new Date(firstdate + " " + firsttime);
	date1.setTime(date1temp.getTime());
	}
	else return false; // otherwise exits
	
	if (isValidDate(seconddate) && isValidTime(secondtime)) { // Validates second date 
	date2temp = new Date(seconddate + " " + secondtime);
	date2.setTime(date2temp.getTime());
	}
	else return false; // otherwise exits
	
	// sets difference date to difference of first date and second date
	
	diff.setTime(Math.abs(date1.getTime() - date2.getTime()));
	
	timediff = diff.getTime();
	
	weeks = Math.floor(timediff / (1000 * 60 * 60 * 24 * 7));
	timediff -= weeks * (1000 * 60 * 60 * 24 * 7);
	
	days = Math.floor(timediff / (1000 * 60 * 60 * 24)); 
	timediff -= days * (1000 * 60 * 60 * 24);
	
	hours = Math.floor(timediff / (1000 * 60 * 60)); 
	timediff -= hours * (1000 * 60 * 60);
	
	mins = Math.floor(timediff / (1000 * 60)); 
	timediff -= mins * (1000 * 60);
	
	secs = Math.floor(timediff / 1000); 
	timediff -= secs * 1000;
	
	if (typediff=="weeks") {
		return weeks;
	} else if (typediff=="days") { 
		return days
	} else if (typediff=="hours") { 
		return hours 
	} else if (typediff=="mins") {
		return mins 
	} else if (typediff=="secs") {
		return secs;
	}

}

function isValidDate(dateStr) {
// Date validation function courtesty of 
// Sandeep V. Tamhankar (stamhankar@hotmail.com) -->

// Checks for the following valid date formats:
// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY

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

var matchArray = dateStr.match(datePat); // is the format ok?
if (matchArray == null) {
alert(dateStr + " 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;
}

function isValidTime(timeStr) {
// Time validation function courtesty of 
// Sandeep V. Tamhankar (stamhankar@hotmail.com) -->

// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.

var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;

var matchArray = timeStr.match(timePat);
if (matchArray == null) {
alert("Time is not in a valid format.");
return false;
}
hour = matchArray[1];
minute = matchArray[2];
second = matchArray[4];
ampm = matchArray[6];

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

if (hour < 0  || hour > 23) {
alert("Hour must be between 1 and 12. (or 0 and 23 for military time)");
return false;
}
if (hour <= 12 && ampm == null) {
//if (confirm("Please indicate which time format you are using.  OK = Standard Time, CANCEL = Military Time")) {
//alert("You must specify AM or PM.");
//return false;
//   }
}
if  (hour > 12 && ampm != null) {
alert("You can't specify AM or PM for military time.");
return false;
}
if (minute < 0 || minute > 59) {
alert ("Minute must be between 0 and 59.");
return false;
}
if (second != null && (second < 0 || second > 59)) {
alert ("Second must be between 0 and 59.");
return false;
}
return true;
}


function Trim(s) 
{
  // Remove leading spaces and carriage returns
  
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r') )
  {
    s = s.substring(1,s.length);
  }
  
  /*
  while (s.substring(0,5)='&nbps') {
	s = s.substring(1,s.length-5);
  }
  */

  // Remove trailing spaces and carriage returns

  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))
  {
    s = s.substring(0,s.length-1);
  }
  
  /*
  while (s.substring(0,5)='&nbps') {
	s = s.substring(0,s.length-6);
  } 
  */
  
  return s;
}


function isPositiveInteger(inputVal) 
{ 
	var inputStr = inputVal.toString(); 
	for (var i = 0; i < inputStr.length; i++) 
	{ 
		var oneChar = inputStr.charAt(i); 
		if (oneChar < "0" || oneChar > "9") 
		{ 
			return false; 
		} 
	} 
return true; 
}

function isFloat(inputVal, strDecimalDenoter) 
{ 
	var inputStr = inputVal.toString(); 
	var startingIndex; 
	var intDotCount = 0; 
	
	if (inputStr.charAt(0) == "-") 
	{ 
		startingIndex = 1; 
	} else { 
		startingIndex = 0; 
	} 
	for (var i = startingIndex; i < inputStr.length; i++) 
	{ 
		var oneChar = inputStr.charAt(i); 
		if ((oneChar < "0" || oneChar > "9") && (oneChar != ",")) 
		{ 
			return false; 
		} else { 
			if (oneChar == ",") 
			{ 
				intDotCount += 1; 
				if (intDotCount > 1) 
				{ 
					return false; 
				} 
			} 
		} 
	} 
return true; 
}

function isValidEmail(strEmail) 
{ 
	//alert("debug");
             var at="@";
             var dot=".";
             var lat=strEmail.indexOf(at);
             var lstr=strEmail.length;
			 var ldot=strEmail.indexOf(dot);

             if (strEmail.indexOf(at)==-1)
             {
               return false 
             }
             if (strEmail.indexOf(at)==-1 || strEmail.indexOf(at)==0 || strEmail.indexOf(at)==lstr)
             {
               return false 
             } 
             if (strEmail.indexOf(dot)==-1 || strEmail.indexOf(dot)==0 || strEmail.indexOf(dot)==lstr)
             {
			   return false
			 } 
             if (strEmail.indexOf(at,(lat+1))!=-1)
             {
               return false
             } 
             if (strEmail.substring(lat-1,lat)==dot || strEmail.substring(lat+1,lat+2)==dot)
             { 
                return false 
             } 
	         if (strEmail.indexOf(dot,(lat+2))==-1)
             { 
                return false 
             }
             if (strEmail.indexOf(" ")!=-1)
    	     { 
                 return false
             }
        return true;
}