var invalidDomainName = " ~!@#$%^&*()_+=|\\[]{}\"':;?/,<>\t"; // invalid characters in a domainname
function isValidDomainName(value)
{
	if (value.indexOf('.') == -1)
	{
		alert("Please enter a valid domain name.");
		return false;
	}	
    var length = value.length;
	if ( length < 4 || length > 67 )
	{
		alert("Please enter a valid domain name.");
		return false;
	}	
	value=value.trim();
	for (var i = 0;  i < value.length;  i++)
	{
		ch = value.charAt(i);
		if (invalidDomainName.indexOf(ch) != -1)
		{		alert('Invalid "'+ch+'" characters in a Domain name.\n Please enter a valid Domain name.' );
			return false;
		}
	} 
	return true;

}

function check_price(field, field_name){
	field.value=field.value.replace(/\s+$/g,'');
	field.value=field.value.replace(/^\s+/g,'');
	if (field.value.match(/[^0-9,\.\$\,]/)){	
		alert('Please enter a valid '+field_name+'.');
		field.focus();
		return false;
	}
	else
		return true;
}

function check_numeric(field, field_name){
	field.value=field.value.replace(/\s+$/g,'');
	field.value=field.value.replace(/^\s+/g,'');
	if (field.value.match(/\D/)){	
		alert('Please enter a number into '+field_name+'.');
		field.focus();
		return false;
	}
	else
		return true;
}


function CheckAlhanumeric(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		if (document.forms[frmName].elements[itemName].value.match(/^[a-zA-Z][0-9a-zA-Z-]*$/))
			return true;
		else{
			alert(msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function trimSpaces(s)
{	
	return s.replace(' ','');
}

function switchSelection(field,value)
{
	for (var i=0; i < field.length; i++ )
	{
		if (field[i].value == value) {
			field[i].checked = true;
		}
	}
}

function checkLenGreater(frmName, itemName, itemLen, msg)
{
	if (document.forms[frmName].elements[itemName].value.length != 0)
		if (document.forms[frmName].elements[itemName].value.length < itemLen){
			alert(msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	return true;
}

function checkDate(frmName, itemName, msg, month, day, year)
{
	if (document.forms[frmName].elements[itemName].value.length != 0)
	{
		var d = new Date (year, month-1, day);
		if (	d.getFullYear() != year
			||	(d.getMonth()+1) != month
			||	d.getDate() != day
			||	year < 1753			//SQL Server datetime limits
			||	year > 9999)
		{
			alert("Invalid "+msg+"!");
			document.forms[frmName].elements[itemName].focus();
			return false;
		}
	}
	return true;
}

function checkEmail(frmName, itemName, msg)
{
	str_value = document.forms[frmName].elements[itemName].value;
	str_value = str_value.replace(';',',');	
	while (str_value.length != 0) {
		pos = str_value.indexOf(',');
		pos = (pos == -1)?str_value.length:pos;
		email_string = str_value.substring(0,pos);
		email_string = email_string.replace(' ','');
		if (!checkEmailString(email_string)) {
			alert("Invalid "+msg+'\n'+email_string+'.');
			document.forms[frmName].elements[itemName].focus();
			return false;
		}
		str_value = str_value.substring(pos+1,str_value.length);
	}
	return true;
}

function checkEmailString(email_string) {
	str=email_string;
	var supported = 0;
	var valid     = 0;
	if (window.RegExp) {
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported) 
		valid=(str.indexOf(".") > 2) && (str.indexOf("@") > 0)
	else {
		var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)|(.*\")|(.*\\[|\\]|\\)|\\(|\\{|\\}|\\>|\\<|\\,|\\:|\\;|\\')|(.*\x7F)|(.*[\x01-\x20])");
		var r2 = new RegExp("^.+\\@(\\[?)(([a-zA-Z0-9\\-\\.])|([^a-zA-Z0-9]))+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");

		valid= (!r1.test(str) && r2.test(str));
	}
	return valid;
}

function checkInt(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		var val;
		val=parseInt(document.forms[frmName].elements[itemName].value.replace(/,/g, ""));
		if (! isNaN(val)){
			document.forms[frmName].elements[itemName].value=val;
		}
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkPosInt(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		var val;
		val=parseInt(document.forms[frmName].elements[itemName].value.replace(/,/g, ""));
		if (! isNaN(val) && (val >=0)){
			document.forms[frmName].elements[itemName].value=val;
		}
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkHex(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		if (document.forms[frmName].elements[itemName].value.match(/^[0-9a-fA-F]*$/))
			return true;
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkFloat(frmName, itemName, msg)
{
	if (document.forms[frmName].elements[itemName].value.length){
		var val;
		val=parseFloat(document.forms[frmName].elements[itemName].value.replace(/,/g, ""));
		if (! isNaN(val)){
			if (val!=document.forms[frmName].elements[itemName].value){
				alert('Invalid '+msg);
				document.forms[frmName].elements[itemName].value=val;
				return false;
			}
		}
		else{
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	}
	return true;
}

function checkNotEmpty(frmName, itemName, msg)
{
	tmp_str=document.forms[frmName].elements[itemName].value;
	tmp_str=tmp_str.replace(/ /g,'');
	if ( tmp_str.length == 0)
	{
		alert(msg);
		document.forms[frmName].elements[itemName].focus();
		document.forms[frmName].elements[itemName].select();
		return false;
	}
	return true;
}

function preDelete()
{
	return confirm('Are you sure you want to delete this item?');
}

function checkLen(frmName, itemName, itemLen, msg)
{
	if (document.forms[frmName].elements[itemName].value.length != 0)
		if (document.forms[frmName].elements[itemName].value.length != itemLen){
			alert('Invalid '+msg);
			document.forms[frmName].elements[itemName].focus();
			document.forms[frmName].elements[itemName].select();
			return false;
		}
	return true;
}

var DateDelimiter="/"; 

function CheckDateStr(str_date)
{
	var d=new Date(str_date);
	if (!isNaN(d))
	{
		if (d.getFullYear()<1900)
			return true;
		if (d.getMonth()<0 || d.getMonth()>11)
			return true;
		if (d.getDate()<=0)
			return true;
		if ((d.getMonth()==0 || d.getMonth()==2 || d.getMonth()==4 || d.getMonth()==6 || d.getMonth()==7 || d.getMonth()==9 || d.getMonth()==11) &&
			(d.getDate()>31))
			return true;
		if ((d.getMonth()==3 || d.getMonth()==5 || d.getMonth()==8 || d.getMonth()==10) &&
			(d.getDate()>30))
			return true;
		if ((d.getMonth()==1) && (d.getDate()>29))
			return true;
		return false;
	}
	return true;
}
// Check Date Part
function checkdate(object_value)
    {
    //Returns true if value is a date format or is NULL
    //otherwise returns false	
    if (object_value.length == 0)
        return true;
    //Returns true if value is a date in the mm/dd/yyyy format
	isplit = object_value.indexOf('/');
	if (isplit == -1 || isplit == object_value.length)
		return false;
    sMonth = object_value.substring(0, isplit);
	if (sMonth.length == 0)
        return false;
	isplit = object_value.indexOf('/', isplit + 1);
	if (isplit == -1 || (isplit + 1 ) == object_value.length)
		return false;
    sDay = object_value.substring((sMonth.length + 1), isplit);
	if (sDay.length == 0)
        return false;
	sYear = object_value.substring(isplit + 1);
	if (!checkinteger(sMonth)) //check month
		return false;
	else
	if (!checkrange(sMonth, 1, 12)) //check month
		return false;
	else
	if (!checkinteger(sYear)) //check year
		return false;
	else
	if (!checkrange(sYear, 0, 9999)) //check year
		return false;
	else
	if (!checkinteger(sDay)) //check day
		return false;
	else
	if (!checkday(sYear, sMonth, sDay)) // check day
		return false;
	else
		return true;
    }
function checkday(checkYear, checkMonth, checkDay)
    {
	maxDay = 31;
	if (checkMonth == 4 || checkMonth == 6 ||
			checkMonth == 9 || checkMonth == 11)
		maxDay = 30;
	else
	if (checkMonth == 2)
	{
		if (checkYear % 4 > 0)
			maxDay =28;
		else
		if (checkYear % 100 == 0 && checkYear % 400 > 0)
			maxDay = 28;
		else
			maxDay = 29;
	}
	return checkrange(checkDay, 1, maxDay); //check day
    }
function checkinteger(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	
    if (object_value.length == 0)
        return true;
    //Returns true if value is an integer defined as
    //   having an optional leading + or -.
    //   otherwise containing only the characters 0-9.
	var decimal_format = ".";
	var check_char;
    //The first character can be + -  blank or a digit.
	check_char = object_value.indexOf(decimal_format)
    //Was it a decimal?
    if (check_char < 1)
	return checknumber(object_value);
    else
	return false;
    }

function numberrange(object_value, min_value, max_value)
    {
    // check minimum
    if (min_value != null)
	{
        if (object_value < min_value)
		return false;
	}
    // check maximum
    if (max_value != null)
	{
	if (object_value > max_value)
		return false;
	}
   //All tests passed, so...
    return true;
    }

function checknumber(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	
    if (object_value.length == 0)
        return true;
    //Returns true if value is a number defined as
    //   having an optional leading + or -.
    //   having at most 1 decimal point.
    //   otherwise containing only the characters 0-9.
	var start_format = " .+-0123456789";
	var number_format = " .0123456789";
	var check_char;
	var decimal = false;
	var trailing_blank = false;
	var digits = false;
    //The first character can be + - .  blank or a digit.
	check_char = start_format.indexOf(object_value.charAt(0))
    //Was it a decimal?
	if (check_char == 1)
	    decimal = true;
	else if (check_char < 1)
		return false;
   
	//Remaining characters can be only . or a digit, but only one decimal.
	for (var i = 1; i < object_value.length; i++)
	{
		check_char = number_format.indexOf(object_value.charAt(i))
		if (check_char < 0)
			return false;
		else if (check_char == 1)
		{
			if (decimal)		// Second decimal.
				return false;
			else
				decimal = true;
		}
		else if (check_char == 0)
		{
			if (decimal || digits)	
				trailing_blank = true;
        // ignore leading blanks

		}
	        else if (trailing_blank)
			return false;
		else
			digits = true;
	}	
    //All tests passed, so...
    return true
    }

function checkrange(object_value, min_value, max_value)
    {
    //if value is in range then return true else return false
    if (object_value.length == 0)
        return true;
    if (!checknumber(object_value))
	{
	return false;
	}
    else
	{
	return (numberrange((eval(object_value)), min_value, max_value));
	}
    //All tests passed, so...
    return true;
    }
function  check_interval(val_from,val_to)
    {
    if  ((val_from=="")||(val_to=="") )
        {
        alert("Invalid date")
        return false;
		} 

    if  (!checkdate(val_from))
		{
        alert("Invalid date")
            return false; 
		}
    if  (!checkdate(val_to))
		{
        alert("Invalid date")
            return false; 
		}
	var from = new Date (val_from);
	var to   = new Date (val_to);
	if (to < from)		
	{ alert("Invalid interval")
       return false; 
	}
	
		
    return true;
    }