/* checks the number of characters in a textarea box*/
function CheckCharacters(strValue,intMaxLimit){
	var intLength = strValue.length;
	if (intLength > intMaxLimit){
		return false;
	}
}

function trim(s) {
	while (s.substring(0,1) == ' ') {
	    s = s.substring(1,s.length);
	}
	
	while (s.substring(s.length-1,s.length) == ' ') {
    	s = s.substring(0,s.length-1);
	}
	return s;
}

var strFieldValue;
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

// Check that a string contains only numbers
function isNumeric(string, ignoreWhiteSpace) {
	if (string.search) {
		if ((ignoreWhiteSpace && string.search(/[^\d\s]/) != -1) || (!ignoreWhiteSpace && string.search(/\D/) != -1)) return false;
	}
	return true;
}

// decimal point character differs by language and culture
var decimalPointDelimiter = ".";
var defaultEmptyOK = false;

// isFloat - True if string s is an unsigned floating point (real) number. 
function isFloat(s){
	var i;
    var seenDecimalPoint = false;
    if (isEmpty(s)) {
       if (isFloat.arguments.length == 1) {
	   		return defaultEmptyOK;
	   }
	   else {
	   	  return (isFloat.arguments[1] == true);
	   }
	}

    if (s == decimalPointDelimiter){ return false;}
    // Search through string's characters one by one
    // until we find a non-numeric character.
    // When we do, return false; if we don't, return true.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);

        if ((c == decimalPointDelimiter) && !seenDecimalPoint) {
			 seenDecimalPoint = true;
		}
        else if (!isDigit(c)) { return false;}
    }
    // All characters are numbers.
	return true;
}

// Check whether string s is empty.
function isEmpty(s){   
	return ((s == null) || (s.length == 0))
}

// Returns true if character c is a digit (0 .. 9)
function isDigit (c){   
	return ((c >= "0") && (c <= "9"))
}

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 <= 2; 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 (month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (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
}

function RemoveInvalidCharacters(theField,strValue,intIncludeCommas){
	var strOutput = "";
	var strInvalids = "" ;
	if (intIncludeCommas == 1) {
		strInvalids = ",<>|^";}
	else{
		strInvalids = "<>|^";}
	for (i = 0; i < strValue.length; i++) {
		 if (strInvalids.indexOf(strValue.charAt(i)) == -1)
          	strOutput = strOutput + strValue.charAt(i)
	}
	theField.value = strOutput;
}
 
 function echeck(str) {
		var at="@";
		var dot=".";
		var lat=str.indexOf(at);
		var lstr=str.length;
		var ldot=str.indexOf(dot);
		if (str.indexOf(at)==-1){
		   return false;
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return false;
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return false;
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    return false;
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return false;
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    return false;
		 }
		
		 if (str.indexOf(" ")!=-1){
		    return false;
		 }

 		 return true;			
	}