// this function checks to see if the valid form of email address has been entered,
// If not, it displays the error message,
// focuses the control	and returns false

function checkEmail(obj,msg) {
	if (!checkText(obj,msg)) return false;
	if (!checkEmailChar(obj)){
		alert(msg);
		obj.focus();
		return false;
	};
	return true;
};

function checkEmailChar(obj) {
	invalidChars=" /:,;";
	for (i=0; i<invalidChars.length;i++){
		badChar = invalidChars.charAt(i);
			if (obj.value.indexOf(badChar,0) !=-1) {
				return false;
			};
	};
	atPos = obj.value.indexOf("@", 1);
	if (atPos == -1){
				return false;
	};
	if (obj.value.indexOf("@",atPos+1)!= -1){
				return false;
	};
	dotPos = obj.value.indexOf(".", atPos);
	if (dotPos <=0){
				return false;
	};
	if (dotPos+3 > obj.value.length){
				return false;
	};

	return true;
};

// this function checks to see if a radio-button has not been selected
// If not, it displays the error message,
// focuses the control	and returns true

function checkRadio(obj,msg)
{	var itemchecked = false;
	for(var j = 0 ; j < obj.length ; ++j)
	{	if(obj[j].checked)
		{	itemchecked = true;
			break;
		};
	};
	if(!itemchecked)
	{ 	alert(msg);
		obj[0].focus()
		return false;
	};
	return true;

};

// this function checks to see if a pull-down has not been selected
// past the first item OR if the value option selected is '0' or '',
// If not, it displays the error message,
// focuses the control	and returns false

function checkPullDown(obj,msg) {
	if (obj.selectedIndex==0 || obj.options[obj.selectedIndex].value=='0' || obj.options[obj.selectedIndex].value=='') {
		alert(msg);
		obj.focus();
		return false;
	};
	return true;
};

// this function checks to see whether a text input or textarea
// is blank or is all white space.
// If so, it displays the error message,
// focuses the control	and returns false

function checkText(obj,msg) {
	var str = obj.value+'';
	var allWhite = true;
	//var whiteTrail;
	for(var c=0; c<str.length; c++) {
		if (!isWhite(str.charAt(c))) allWhite=false;
	//	if (c=str.length) && (isWhite(str.charAt(str.length)))
	};

	if (allWhite || str=='') {
		obj.value="";
		alert(msg);
		obj.focus();
		return false;
	};
		remove_XS_whitespace(obj);
	return true;
};

// this function checks to see whether a text input or textarea
// is blank or is all white space.
// If it is all white space, it cleans it out and return true

function cleanNonRequiredText(obj) {
	var str = obj.value+'';
	var allWhite = true;
	for(var c=0; c<str.length; c++) {
		if (!isWhite(str.charAt(c))) {
			allWhite=false; 
		};
	}
	if (allWhite || str=='') {
		obj.value="";
		return true;
	}else{
		remove_XS_whitespace(obj);
		return false;		
	};
};

// this function checks to see whether a text input or textarea
// is blank or is all white space.
// If so, it displays the error message,
// focuses the control	and returns true
// It also checks the number of chars and displays the too many
// chars message if that is exceeded

function checkTextArea(obj,msg,max,msgmax) {
	var str = obj.value+'';
	if (str.length>max) {
		alert(msgmax + ' [There are currently '+str.length+' characters]');
		obj.focus();
		return false;
	};
	var allWhite = true;
	for(var c=0; c<str.length; c++) {
		if (!isWhite(str.charAt(c))) allWhite=false;
	}
	if (allWhite || str=='') {
		obj.value="";
		alert(msg);
		obj.focus();
		return false;
	};
	return true;
};

// this function checks to see whether a text input 
// contains " or '.
// If so, it displays the error message,
// focuses the control	and returns false

function checkQuoteMark(obj, msg)
{
	if ((obj.value.indexOf('"') >= 0) || (obj.value.indexOf("'") >= 0))
	{ 	alert(msg);
		obj.focus();
		return false;
	};
	
	return true;
};


function checkMax(obj,max,msgmax) {
	var str = obj.value+'';
	if (str.length>max) {
		alert(msgmax + ' [There are currently '+str.length+' characters]');
		obj.focus();
		return false;
	};
	return true;
};

// These functions check to see if the text field 
// contains a valid date
// If not, they display an error message,
// focus the control and return false.

// 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 checkDate(obj){
	sDateString = obj.value
	
	var daysInMonth = DaysArray(12)
	var pos1=sDateString.indexOf(dtCh)
	var pos2=sDateString.indexOf(dtCh,pos1+1)
	var strMonth=sDateString.substring(0,pos1)
	var strDay=sDateString.substring(pos1+1,pos2)
	var strYear=sDateString.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")
		obj.focus()
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		obj.focus()
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		obj.focus()
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		obj.focus()
		return false
	}
	if (sDateString.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(sDateString, dtCh))==false){
		alert("Please enter a valid date")
		obj.focus()
		return false
	}
return true
}

function isWhite(ch) {
	if (ch==' ' || ch=='	' || ch=="\n" || ch=="\r") return true;
	return false;
};


function remove_XS_whitespace(obj)
{
  var tmpStr = "";
  var obj_length = obj.value.length;
  var obj_length_minus_1 = obj.value.length - 1;
  for (i = 0; i < obj_length; i++)
  {
    if (obj.value.charAt(i) != ' ')
    {
      tmpStr += obj.value.charAt(i);
    }
    else
    {
      if (tmpStr.length > 0)
      {
        if (obj.value.charAt(i+1) != ' ' && i != obj_length_minus_1)
        {
          tmpStr += obj.value.charAt(i);
        }
      }
    }
  }
  obj.value = tmpStr;
};

function isAllDigits(s)
{
   var test = "" + s;
   for (var k=0; k < test.length; k++)
   {
     var c = test.substring(k, k+1);
     if (isDigit(c) == false)
      {  
         return false; 
      }
   }
   return true;
}

function isDigit(c)
{
   var test = "" + c;
   if (test == "0" || test =="1" || test =="2" || test == "3" ||
       test == "4" || test =="5" || test =="6" || test == "7" ||   
       test == "8" || test =="9")
   { 
      return true; 
   }
   return false;   
}