function isPhone(entered, alertbox){
//checks for a valid phone number format
	with (entered)
	{
		var stripped = value.replace(/[\s()+-]|ext\.?/gi, "");

		if (!(/\d{10,}/i).test(stripped)) {
			 if (alertbox!="") {alert(alertbox);} return false;
		}else{
			   return true;
		}
	}
}

function isValidEmail (entered, alertbox) {

	with (entered){

		var checkTLD=1;

		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
		
		var emailPat=/^(.+)@(.+)$/;

		var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

		var validChars="\[^\\s" + specialChars + "\]";

		var quotedUser="(\"[^\"]*\")";

		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

		var atom=validChars + '+';

		var word="(" + atom + "|" + quotedUser + ")";

		var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

		var matchArray=value.match(emailPat);
		
		if (matchArray==null) {

		if (alertbox) {alert("Email address seems incorrect (check @ and .'s)")};
		return false;
		}
		var user=matchArray[1];
		var domain=matchArray[2];

		for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
		if (alertbox) {alert("Ths username contains invalid characters.")};
		return false;
		   }
		}
		for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
		if (alertbox) {alert("Ths domain name contains invalid characters.")};
		return false;
		   }
		}

		if (user.match(userPat)==null) {

		if (alertbox) {alert("The username doesn't seem to be valid.")};
		return false;
		}
		
		var IPArray=domain.match(ipDomainPat);
		if (IPArray!=null) {

		for (var i=1;i<=4;i++) {
		if (IPArray[i]>255) {
		if (alertbox) {alert("Destination IP address is invalid!")};
		return false;
		   }
		}
		return true;
		}

		var atomPat=new RegExp("^" + atom + "$");
		var domArr=domain.split(".");
		var len=domArr.length;
		for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
		if (alertbox) {alert("The domain name does not seem to be valid.")};
		return false;
		   }
		}
				
		if (checkTLD && domArr[domArr.length-1].length!=2 && 
		domArr[domArr.length-1].search(knownDomsPat)==-1) {
		if (alertbox) {alert("The address must end in a well-known domain or two letter " + "country.")};
		return false;
		}
		
		if (len<2) {
		if (alertbox) {alert("This address is missing a hostname!")};
		return false;
		}

		return true;
	}
}

function inRange(entered, min, max, alertbox, datatype){
// checks a value is in the max and min range specified
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 isEmpty(entered, alertbox){
// checks a value is specified (not empty)
with (entered)
	{
	//trim the value
        t_str = value;
        t_str1 = t_str.replace(/^(\s)*/, '');
        trimmedstr = t_str1.replace(/(\s)*$/, '');
	//check if empty
	if (trimmedstr==null || trimmedstr.length==0)
		{if (alertbox!="") {alert(alertbox);} return false;}
	else {return true;}
	}
}

function isInteger(entered, alertbox){
// checks for an integer (+ or -)
with (entered)
	{
	if (value!=parseInt(value))
		{if (alertbox!="") {alert(alertbox);} return false;}
	else {return true;}
	}
}

function isFloat(entered, alertbox){
// checks for a decimal 
with (entered)
	{
	if (value!=parseFloat(value))
		{if (alertbox!="") {alert(alertbox);} return false;}
	else {return true;}
	}
}


function trim(entered)
{
with (entered)
    {
    str = value;
    s = str.replace(/^(\s)*/, '');
    s = s.replace(/(\s)*$/, '');
    return s;
    }
}



function isSingleSelected(entered, alertbox){
// checks for a selected item (mandatory check)
with (entered)
	{
	//if (entered.checked) {return true;}
	var count=0;
	if (entered.checked)
		{count++;}
	if (count==0)
		{if (alertbox!="") {alert(alertbox);} return false;}
	else 
		{return true;}
	}	
}

function isSelected(entered, alertbox, thistype){
// checks for a selected item (mandatory check)
with (entered)
	{
	if (thistype.toLowerCase()=='select')
		{
		if (selectedIndex==-1 || options[selectedIndex].value=="")
			{if (alertbox!="") {alert(alertbox);} return false;}
		else {return true;}
		}
	if (thistype.toLowerCase()=='multiselect')
		{
		if (selectedIndex==-1)
			{if (alertbox!="") {alert(alertbox);} return false;}
		else {return true;}
		}	
	if (thistype.toLowerCase()=='radio' || thistype.toLowerCase()=='checkbox')
		{
		var count=0;
		if (entered.length)
			{
			for (var i=0;i<entered.length;i++)
				{if (entered[i].checked==true){count++;}}
			}
		else
			{
			if (entered.checked==true) {count++;}
			}
		if (count==0)
			{if (alertbox!="") {alert(alertbox);} return false;}
		else {return true;}
		}
	}	
	
}

function deletekey(e) {
    var thekeycode;

    if (document.all) {
        e = window.event;
		var thekeycode = e.keyCode;
    	}
    else
        if (document.layers)
		var thekeycode = e.which;
 	
	// 46 Delete, 8 Backspace
    if (thekeycode  == 46 || thekeycode == 8) {
        if (document.layers){
            return true;}
        else if (document.all){
            //e.returnValue = true;
			return true;}
    	}
	
}

function MaxChars(entered,maxChars,label)
// checks a field has not exceeded max characters
{
with (entered)
	{
	var charsover=value.length-maxChars;
	if (charsover > 0)
	//if (value.length > maxChars)
		{
		if (label== null){label=entered.name;}
		var charsoverstring=''
		charsoverstring=' (currently ' + charsover + ' character(s) too many)';
		alert('The ' + label + ' can have a maximum of ' + maxChars + ' characters.' + charsoverstring);
		return true;
		}
	else 
		{return false;}
	}
}

function MinChars(entered,minChars,label)
// checks a field has not exceeded max characters
{
with (entered)
	{
	var charsunder=minChars-value.length;
	if (charsunder > 0)
	//if (value.length > maxChars)
		{
		if (label== null){label=entered.name;}
		var charsunderstring=''
		if (charsunder>0)
			charsunderstring=' (currently ' + charsunder + ' character(s) too few)';
		alert('The ' + label + ' can have a minimum of ' + minChars + ' characters.' + charsunderstring);return true;
		}
	else 
		{return false;}
	}
}

function isCFDate(entered,alertbox,mandatory)
// checks a validated date  to see if it is actually a date (for use with CF_date)
{
with (entered) 
	{
	var myDateStr = entered.value;
	var myDateName = entered.name;
	var myDateForm = entered.form.name;
	
	var myDateDay = myDateName + '_day';
	var myDateMonth = myDateName + '_month';
	var myDateYear = myDateName + '_year';
	
	// get the selected index of the dropdowns
	var myDateDaySelectedIndex = eval(myDateForm + '.' + myDateDay + '.selectedIndex');
	var myDateMonthSelectedIndex = eval(myDateForm + '.' + myDateMonth + '.selectedIndex');
	var myDateYearSelectedIndex = eval(myDateForm + '.' + myDateYear + '.selectedIndex');
	
	// add parts together to flag if date any parts are selected
	var datePartSelected=myDateDaySelectedIndex+myDateMonthSelectedIndex+myDateYearSelectedIndex;
	
	/* Using the form values, create a new date object which looks like "Wed Jan 1 00:00:00 EST 1975". */
	var myDate = new Date(myDateStr);
	//non-valid date (empty or bad)
	if (isNaN(myDate))
		{
		//are all parts empty?
		if (!datePartSelected)
			{ //yes
			if (!mandatory) 
				// ok if not mandatory field
				{return true;} 
			else 
				// NOT ok if its mandatory field (must be a valid date)
				{if (alertbox!="") {alert(alertbox);} return false;}
			}
		else //no
			{if (alertbox!="") {alert(alertbox);} return false;}
		}
	else {return true;}
	}
}
	
/*
function validateform(thisform)
{
// 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;};
if (!isValidDate(myDateString, "DMY")) { alert("The date is not in the correct format."); }
}
}*/