function validate(){
	this.formName = '';
	this.i = 0;
	this.fieldN = new Array();	// Field name
	this.fieldV = new Array();	// Field value
	this.fieldT = new Array();	// Field type (text, editor, checkbox, radio, select, mselect, date)
	this.fieldI = new Array();	// Field Id
	this.fieldC = new Array();	// Check for equal field
	this.fieldEQ = new Array();	// Check for equal supplied string match
	this.fieldNM = new Array();	// if 1 Check for field is Numeric
	this.fieldGT = new Array();	// Check for Greater than supplied string	(works for field type text and date only)	
	this.fieldLT = new Array();	// Check for Less than supplied string	(works for field type text and date only)
	this.fieldGE = new Array();	// Check for Grter thn o equal to supplied str(works for field type text & date only)
	this.fieldLE = new Array();	// Check for Less than o equal to supplied string(works for field type text & date only)
	this.fieldBT = new Array();	// Check for between 2 values	(works for field type text only)
	
	this.checkEmpty = checkEmpty;
	this.checkDate = checkDate;
	this.checkEmail = checkEmail;
	this.checkURL = checkURL;
}

function checkEmpty(){
	var err = "";
	var frmObj = document.forms[this.formName];
	for(var i=0; i<this.fieldN.length; i++){
		var valueInField = document.forms[this.formName].elements[this.fieldN[i]].value;
		this.i = i;
		if(this.fieldT[i] == "date"){
			valueInField = formatDate(document.forms[this.formName].elements[this.fieldN[i]].value);
			var dateCheck = this.checkDate();
			if(!dateCheck){
				err += this.fieldV[i] + "\n";
			}
		}
		if(this.fieldNM[i] == 1){
			if(isNaN(valueInField)){
				err += this.fieldV[i] + " (Not a Number)\n";
			}					
		}
		
		if((this.fieldT[i] == "select")||(this.fieldT[i] == "mselect")){
		if(document.forms[this.formName].elements[this.fieldN[i]].selectedIndex == -1 || valueInField == 0){
				err += this.fieldV[i] + "\n";
			}
		}else if((valueInField == "") || (valueInField == " ")) {
			err += this.fieldV[i] + "\n";
		}else if(this.fieldC[i]){
			var frmCElmVal = document.forms[this.formName].elements[this.fieldC[i]].value;
			if(valueInField != frmCElmVal){
				err += this.fieldV[i] + " (Mismatch)\n";
			}
		}else if((this.fieldN[i].indexOf("email") >= 0) || (this.fieldN[i].indexOf("Email") >= 0)){
			if(!this.checkEmail()) {
				err += this.fieldV[i] + " (Invalid Email Id)\n";
			}
		}else if(this.fieldN[i].indexOf("url") >= 0){
			if(!this.checkURL()) {
				err += this.fieldV[i] + " (Invalid URL)\n";
			}
		}else if((this.fieldN[i].indexOf("website") >= 0) || (this.fieldN[i].indexOf("WebSite") >= 0)) {
			if(!this.checkURL()) {
				err += this.fieldV[i] + " (Invalid URL)\n";
			}
		}else if(this.fieldEQ[i]) {
			if(valueInField != this.fieldEQ[i]) {
				err += this.fieldV[i] + " (Invalid entry)\n";
			}
		}else if(this.fieldLT[i]) {
			if(valueInField >= this.fieldLT[i]) {
				err += this.fieldV[i] + " (Invalid entry)\n";
			}
		}else if(this.fieldGT[i]) {
			if(valueInField <= this.fieldGT[i]) {
				err += this.fieldV[i] + " (Value entered needs to be more than "+ this.fieldGT[i] +")\n";
			}
		}else if(this.fieldLE[i]) {
			if(valueInField > this.fieldLE[i]) {
				err += this.fieldV[i] + " (Invalid entry)\n";
			}
		}else if(this.fieldGE[i]) {
			if(valueInField < this.fieldGE[i]) {
				err += this.fieldV[i] + " (Invalid entry)\n";
			}
		}else if(this.fieldBT[i]) {
			var btSplit = new Array();
			btSplit = this.fieldBT[i].split('|');
			if(btSplit[0] > btSplit[1]) {
				var tmpSplit = btSplit[0];
				btSplit[0] = btSplit[1];
				btSplit[1] = tmpSplit;
			}
			if((valueInField >= btSplit[0]) && (valueInField <= btSplit[1])) {
				err += this.fieldV[i] + " (Invalid entry)\n";
			}
		}
	}
	if(err != "") {
		var errShow = "Following fields are empty or not entered correctly\n\n";
		errShow += err;
		alert(errShow);
		return false;
	}
	return true;
}
function checkDate(){
	var fieldVal = document.forms[this.formName].elements[this.fieldN[this.i]].value;
	if(!fieldVal || fieldVal==' '){
		return false;
	}
	var dateString = formatDate(fieldVal);
	var dateTimeArr = dateString.split(' ');
	var dateV = dateTimeArr[0];
	var timeV = dateTimeArr[1];
	var dateArr = dateV.split('-');
	var yy = dateArr[0];
	var mm = dateArr[1];
	var dd = dateArr[2];
	var hour = '00';
	var min = '00';
	var sec = '00';
	if(timeV) {
		var timeArr = timeV.split(':');
		hour = timeArr[0];
		min = timeArr[1];
		sec = timeArr[2];
	}

	var checkLeep = yy%4;
	if((checkLeep > 0) && (mm == 2) && (dd > 28)) {
		return false;
	}
	if((checkLeep == 0) && (mm == 2) && (dd > 29)) {
		return false;
	}
	if((dd > 30) && ( (mm == 4) || (mm == 6) || (mm == 9) || (mm == 11))) {
		return false;
	}
	if(isNaN(dd) || isNaN(mm) || isNaN(yy)) {
		return false;
	}
	return true;
}
function checkEmail(){
	var fieldValue = document.forms[this.formName].elements[this.fieldN[this.i]].value;
	var chkAt = fieldValue.indexOf("@");
	var chkDot= fieldValue.indexOf(".");
	var chkHack= fieldValue.indexOf("@.");
	var chkHackA= fieldValue.indexOf(".@");
	if((chkAt >= 0) && (chkDot >= 0) && (chkHack == -1) && (chkHackA == -1) ) {
		return true;
	}
	return false;
}
function checkURL(){
	var fieldValue = document.forms[this.formName].elements[this.fieldN[this.i]].value;
	if(fieldValue.length <= 8) {
		return false;
	}	
	if((fieldValue.substr(0,7) == "http://") ||  (fieldValue.substr(0,8) == "https://")) {
		return true;
	}
	return false;
}

function formatDate(dateString, patern){
	var patern = ((patern == '') || !patern) ? 'yyyy-mm-dd HH:MM:SS' : patern;
	check_time_stamp = dateString.indexOf('-');
	if(check_time_stamp == -1) {
		if(dateString.indexOf('/') > 0){
			// dd/mm/yyyy HH:MM:SS
			var dd = dateString.substr(0,2);
			var mm = dateString.substr(3,2);
			var yy = dateString.substr(6,4);
			var hour = dateString.substr(11,2);
			var min = dateString.substr(14,2);
			var sec = dateString.substr(17,2);
		}else{
			var yy = dateString.substr(0,4);
			var mm = dateString.substr(4,2);
			var dd = dateString.substr(6,2);
			var hour = dateString.substr(8,2);
			var min = dateString.substr(10,2);
			var sec = dateString.substr(12,2);
		}
	}else{
		var dateTimeArr = dateString.split(' ');
		var dateV = dateTimeArr[0];
		var timeV = dateTimeArr[1];
		var dateArr = dateV.split('-');
		var yy = dateArr[0];
		var mm = dateArr[1];
		var dd = dateArr[2];
		if(timeV) {
			var timeArr = timeV.split(':');
			var hour = timeArr[0];
			var min = timeArr[1];
			var sec = timeArr[2];
		}
	}
	hour = (hour == '') ? '00' : hour;
	min = (min == '') ? '00' : min;
	sec = (sec == '') ? '00' : sec;
	patern = patern.replace(/yyyy/g, yy);
	patern = patern.replace(/mm/g, mm);
	patern = patern.replace(/dd/g, dd);
	patern = patern.replace(/HH/g, hour);
	patern = patern.replace(/MM/g, min);
	patern = patern.replace(/SS/g, sec);
	return patern;
}