function trim(txt){
	if (txt.length==0) {
		return '';
	}
	while ( txt.length!=0 && txt.charAt(0)==' '){
		txt=txt.substring(1,txt.length)
	}
	while ( txt.charAt(txt.length-1)==' '){
		txt=txt.substring(0,txt.length-1)
	}
	return txt;
}

function check_required_field(obj_array){
	for (i=0; i < obj_array.length; i++){
		obj_array[i].style.backgroundColor='#FFFFFF';
		if(trim(obj_array[i].value)==''){
			obj_array[i].style.backgroundColor='#F0CECE';
			obj_array[i].focus();
			alert (obj_array[i].title + ' must be specified !');
			return false;
		}
	}
	return true;
}

function check_required_field_temp(obj_array){
	for (i=0; i < obj_array.length; i++){
		if(trim(obj_array[i].value)==''){
			obj_array[i].focus();
			alert (obj_array[i].title + ' must be specified !');
			return false;
		}
	}
	return true;
}

function check_numeric_field(obj_array){
	for (i=0; i < obj_array.length; i++){
		obj_array[i].style.backgroundColor='#FFFFFF';
		if(isNaN(obj_array[i].value)){
			obj_array[i].style.backgroundColor='#F0CECE';
			obj_array[i].focus();
			alert (obj_array[i].title + ' must be numeric !');
			return false;
		}
	}
	return true;	
}

function check_money_field(obj_array){
var index_char;
	for (i=0; i < obj_array.length; i++){
		obj_array[i].style.backgroundColor='#FFFFFF';
		var temp = obj_array[i].value;
		index_char = temp.indexOf('.');
		if(index_char!=-1){
			temp = temp.substr(index_char+1);
			if(temp.indexOf('.')!=-1){
				obj_array[i].style.backgroundColor='#F0CECE';
				obj_array[i].focus();
				alert (obj_array[i].title + ' is invalid numeric !');
				return false;				
			}
		}
	}
	return true;	
}

function check_max_numeric_field(obj_array, max_number){
	for (i=0; i < obj_array.length; i++){
		obj_array[i].style.backgroundColor='#FFFFFF';
		if(obj_array[i].value>max_number){
			obj_array[i].style.backgroundColor='#F0CECE';
			obj_array[i].focus();
			alert (obj_array[i].title + ' cannot greater than ' + max_number + ' !');
			return false;
		}
	}
	return true;	
}

function getkey(evt){	
	var ekeycode;
	evt = (evt) ? evt : ((window.event) ? window.event : null);
	if (evt){
		keycode = (evt.keyCode) ? evt.keyCode : evt.which;
	}
	return keycode
}

function key_integer(e){
	var goods ='1234567890';
	var key, keychar;
	key = getkey(e);
	if (key == null) return true;
	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();
	if (goods.indexOf(keychar) != -1)
		return true;
	if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
		return true;
	return false;	
}

function key_money(e){
	var goods ='1234567890.';
	var key, keychar;
	key = getkey(e);
	if (key == null) return true;
	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();
	if (goods.indexOf(keychar) != -1)
		return true;
	if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
		return true;
	return false;	
}

function key_alphabet(e){
	var goods ='abcdefghijklmnopqrstuvwxyz .!@&()-/?';
	var key, keychar;
	key = getkey(e);
	if (key == null) return true;
	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();


	if (goods.indexOf(keychar) != -1)
		return true;

	if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
		return true;
	return false;
}
function key_alphabet_numeric(e){
	var goods ='abcdefghijklmnopqrstuvwxyz1234567890.';
	var key, keychar;
	key = getkey(e);
	if (key == null) return true;
	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();

	if (goods.indexOf(keychar) != -1)
		return true;

	if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
		return true;
	return false;
}

function key_username(e){
	var goods ='abcdefghijklmnopqrstuvwxyz1234567890.';
	var key, keychar;
	key = getkey(e);
	if (key == null) return true;
	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();

	if (goods.indexOf(keychar) != -1)
		return true;

	if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
		return true;
	return false;
}


function convert_date(datestr, shour, sminute, ssecond){
	var temp = new Date(datestr.substr(6,4), parseInt(datestr.substr(3,2))-1, datestr.substr(0,2), shour, sminute, ssecond);
	return temp;
}

//===========================================date check

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 strYear=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strDay=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 : yyyy-mm-dd")
		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
}

function ValidateForm(){
	var dt=document.frmSample.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
 }
 
function convert_date_value(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)
	
	var temp = new Date(year, month, day);
	return temp;
 }