function isEmail(argvalue) {

  	if (argvalue.indexOf(" ") != -1)
    	return false;
  	else if (argvalue.indexOf("@") == -1)
    	return false;
  	else if (argvalue.indexOf("@") == 0)
    	return false;
  	else if (argvalue.indexOf("@") == (argvalue.length-1))
    	return false;

	var strArray = argvalue.split("@");

	if (strArray[1].indexOf(".") == 0) 
		return false;		
	else if (strArray[1].indexOf(".") == -1) 
		return false;
	else if (strArray[1].indexOf(".") == (strArray[1].length-1)) 
		return false;

	var laniArray = strArray[1].split(".");

	if (laniArray[(laniArray.length)-1]=="")
		return false;

  return true;

}

function isPOBox(argvalue, thectrl){
	argvalue = argvalue.value.replace(/\./g,""); //to remove periods
	argvalue = argvalue.replace(/ /g,"");  //to remove spaces
	argvalue = argvalue.toLowerCase();

	if (typeof(thectrl) == "object" && argvalue.match("pobox") == "pobox")
		return true;
	
	return false;

  	//if (argvalue.indexOf("pobox") > -1)
    //	return false;
  	//else if (argvalue.indexOf("po box") > -1)
    //	return false;
  	//else if (argvalue.indexOf("p.o. box") > -1)
    //	return false;
  	//else if (argvalue.indexOf("p.o box") > -1)
    //	return false;
  	//else if (argvalue.indexOf("po. box") > -1)
    //	return false;

  //return true;
}

// Radio Button Validation
function valButton(btn) {
    var cnt = -1;
    for (var i=btn.length-1; i > -1; i--) {
        if (btn[i].checked) {cnt = i; i = -1;}
    }
    if (cnt > -1) return btn[cnt].value;
    else return null;
}

function doCollapse(elementId) {
	var element = document.getElementById(elementId);
	if(element.style.display != "block"){
		element.style.display = "block";
	}
	else{
		element.style.display = "none";
	}
}

function doUpdateInnerHTML(element, defaulttitle, showtitle, hidetitle) {
	if(element.innerHTML.indexOf(defaulttitle) != -1) {
		element.innerHTML = hidetitle;
	}
	else {
		element.innerHTML = showtitle;
	}
}

function IsNumeric(sText){
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

   for (i = 0; i < sText.length && IsNumber == true; i++){ 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1){
         IsNumber = false;
      }
   }
   return IsNumber;
}

//Sets new color in rows,buttons in Mouse Over/Mouse Out event//
function ChangeBtnColor(tID, mBGColor, mFColor){
    tID.style.background = mBGColor;
    tID.style.color = mFColor;
}

function RestoreBtnColor(tID, mBGColor, mFColor){
    tID.style.background = mBGColor;
    tID.style.color = mFColor;
}

function ChangeElemColor(tID, mBGColor, mFColor){
    document.getElementById(tID).style.background = mBGColor;
    document.getElementById(tID).style.color = mFColor;
}

function RestoreElemColor(tID, mBGColor, mFColor){
    document.getElementById(tID).style.background = mBGColor;
    document.getElementById(tID).style.color = mFColor;
}
//End of set new color in rows,buttons in Mouse Over/Mouse Out event//

//Navigate to other url from onchange event of dropdown box//
//Navigate and check if selectedIndex is greater than zero//
function drpdown_Navigate(drop_down_list){
    var number = drop_down_list.selectedIndex;

    if (number > 0){
	    location.href = drop_down_list.options[number].value;
	}
}

//Navigate without checking the selectedIndex//
function redirect(theurl){
	location.href = theurl;
}

//***Declaring valid date character, minimum year and maximum year***//
var dtCh = "/";
var minYear = 1900;
var maxYear = 2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1 = dtStr.indexOf(dtCh)
	var pos2 = dtStr.indexOf(dtCh,pos1+1)
	var strMonth = dtStr.substring(0,pos1)
	var strDay = dtStr.substring(pos1+1,pos2)
	var strYear = dtStr.substring(pos2+1)

	strYr = strYear

	if (strDay.charAt(0) == "0" && strDay.length > 1) strDay=strDay.substring(1)
	if (strMonth.charAt(0) == "0" && strMonth.length > 1) strMonth=strMonth.substring(1)

	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0) == "0" && strYr.length > 1) strYr=strYr.substring(1)
	}

	month = parseInt(strMonth)
	day = parseInt(strDay)
	year = parseInt(strYr)

	if (pos1 == -1 || pos2 == -1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length < 1 || month < 1 || month > 12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length < 1 || day < 1 || day > 31 || (month == 2 && day > daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year == 0 || year < minYear || year > maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1) != -1 || isInteger(stripCharsInBag(dtStr, dtCh)) == false){
		alert("Please enter a valid date")
		return false
	}
	return true
}

//***Usage***//
//function ValidateForm(){
//	var dt = document.frmSample.txtDate
//	if (isDate(dt.value) == false){
//		dt.focus()
//		return false
//	}
//    return true
//}
//***Usage***//