<!--

function emailvalidation(entered, alertbox)
{
// E-mail Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)
{
apos=value.indexOf("@"); 
dotpos=value.lastIndexOf(".");
lastpos=value.length-1;
if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) 
{if (alertbox) {alert(alertbox);} return false;}
else {return true;}
}
}

function valuevalidation(entered, min, max, alertbox, datatype)
{
// Value Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)

{
checkvalue=parseFloat(value);
if (datatype)
{
smalldatatype=datatype.toLowerCase();
	if (smalldatatype.charAt(0)=="i") 
	{
	checkvalue=parseInt(value)
	}
}
if ((parseFloat(min)==min && checkvalue<min) || (parseFloat(max)==max && checkvalue>max) || value!=checkvalue)
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
}

function digitvalidation(entered, min, max, alertbox, datatype)
{
// Digit Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)
{
checkvalue=parseFloat(value);
if (datatype)
{smalldatatype=datatype.toLowerCase();
if (smalldatatype.charAt(0)=="i") 
{checkvalue=parseInt(value); if (value.indexOf(".")!=-1) {checkvalue=checkvalue+1}};
}
if ((parseFloat(min)==min && value.length<min) || (parseFloat(max)==max && value.length>max) || value!=checkvalue)
{
	if (alertbox!="") 
	{
		alert(alertbox)
	} 
	return false
}
	else {return true;}
}
}

function emptyvalidation(entered, alertbox)
{
// Emptyfield Validation by Henrik Petersen / NetKontoret
// Explained at www.echoecho.com/jsforms.htm
// Please do not remove this line and the two lines above.
with (entered)
{
if (value==null || value=="")
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
}

function maxcharvalidation(entered, max, alertbox)
// GW
{
with (entered)
{
if (value.length>max)
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
}

function extnvalidation(entered, extnList, alertbox)
// GW
{
var regExpDelimeter = /,/g;
with (entered)
{
var strRegExp = extnList.replace(regExpDelimeter, "|");
strRegExp = "(" + strRegExp + ")$";
var regExpExtn = new RegExp(strRegExp,"i");
if (!regExpExtn.test(value) && value!="")
{if (alertbox!="") {alert(alertbox);} return false;}
else {return true;}
}
}


<!-- Original:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

function datevalidation(entered) {
// Checks for the following valid date formats:
// DD/MM/YY   DD/MM/YYYY   DD-MM-YY   DD-MM-YYYY
// Also separates date into month, day, and year variables

var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;

// To require a 4 digit year entry, use this line instead:
// var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

with (entered)
{
var matchArray = value.match(datePat); // is the format ok?
if (matchArray == null) {
alert("Date is not in a valid format.")
return false;
}
}
day = matchArray[1]; // parse date into variables
month = matchArray[3];
year = matchArray[4];
if (month < 1 || month > 12) { // check month range
alert("Month must be between 1 and 12.");
return false;
}
if (day < 1 || day > 31) {
alert("Day must be between 1 and 31.");
return false;
}
if ((month==4 || month==6 || month==9 || month==11) && day==31) {
alert("Month "+month+" doesn't have 31 days!")
return false
}
if (month == 2) { // check for february 29th
var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
if (day>29 || (day==29 && !isleap)) {
alert("February " + year + " doesn't have " + day + " days!");
return false;
   }
}
return true;  // date is valid
}


function formvalidationexample(thisform)
{
// This function is a template and is not to be used. GW

// This function checks the entire form before it is submitted
// Note: This function needs to be customized to fit your form
with (thisform)
{
if (emailvalidation(Email,"Illegal E-mail")==false) {Email.focus(); return false;};
if (valuevalidation(Value,0,5,"Value MUST be in the range 0-5")==false) {Value.focus(); return false;};
if (digitvalidation(Digits,3,4,"You MUST enter 3 or 4 integer digits","I")==false) {Digits.focus(); return false;};
if (emptyvalidation(Whatever,"The textfield is empty")==false) {Whatever.focus(); return false;};
}
}

// -->