<!-- This script is based on the javascript code of Roman Feldblum (web.developer@programmer.net) -->
<!-- Original script : http://javascript.internet.com/forms/format-phone-number.html -->
<!-- Original script is revised by Eralper Yilmaz (http://www.eralper.com) -->
<!-- Revised script : http://www.kodyaz.com -->

var zChar = new Array(' ', '(', ')', '-', '.');
var maxphonelength = 13;
var phonevalue1;
var phonevalue2;
var cursorposition;

function ParseForNumber1(object)
{
	phonevalue1 = ParseChar(object.value, zChar);
}

function ParseForNumber2(object)
{
	phonevalue2 = ParseChar(object.value, zChar);
}

function backspacerUP(object,e) 
{ 
	if(e)
	{ 
		e = e 
	} 
	else {
		e = window.event 
	} 
	if(e.which)
	{ 
		var keycode = e.which 
	} 
	else {
		var keycode = e.keyCode 
	}

	ParseForNumber1(object)

	if(keycode >= 48)
	{
		ValidatePhone(object)
	}
}

function backspacerDOWN(object,e) 
{ 
	if(e)
	{ 
		e = e 
	} 
	else {
		e = window.event 
	} 
	if(e.which)
	{ 
		var keycode = e.which 
	} 
	else {
		var keycode = e.keyCode 
	}
	ParseForNumber2(object)
} 

function GetCursorPosition()
{
	var t1 = phonevalue1;
	var t2 = phonevalue2;
	var bool = false
	for (i=0; i<t1.length; i++)
	{
		if (t1.substring(i,1) != t2.substring(i,1)) 
		{
			if(!bool) 
			{
				cursorposition=i
				bool=true
			}
		}
	}
}

function ValidatePhone(object)
{
	var p = phonevalue1

	p = p.replace(/[^\d]*/gi,"")

	if (p.length < 3) 
	{
		object.value=p
	} 
	else if(p.length==3)
	{
		pp=p;
		d4=p.indexOf('(')
		d5=p.indexOf(')')
		if(d4==-1)
		{
			pp="("+pp;
		}
		if(d5==-1)
		{
			pp=pp+")";
		}
		object.value = pp;
	} 
	else if(p.length>3 && p.length < 7)
	{
		p ="(" + p; 
		l30=p.length;
		p30=p.substring(0,4);
		p30=p30+")"

		p31=p.substring(4,l30);
		pp=p30+p31;

		object.value = pp; 

	} 
	else if(p.length >= 7)
	{
		p ="(" + p; 
		l30=p.length;
		p30=p.substring(0,4);
		p30=p30+")"

		p31=p.substring(4,l30);
		pp=p30+p31;

		l40 = pp.length;
		p40 = pp.substring(0,8);
		p40 = p40 + "-"

		p41 = pp.substring(8,l40);
		ppp = p40 + p41;

		object.value = ppp.substring(0, maxphonelength);
	}

	GetCursorPosition()

	if(cursorposition >= 0)
	{
		if (cursorposition == 0) 
		{
			cursorposition = 2
		} 
		else if (cursorposition <= 2) 
		{
			cursorposition = cursorposition + 1
		} 
		else if (cursorposition <= 5) 
		{
			cursorposition = cursorposition + 2
		} 
		else if (cursorposition == 6) 
		{
			cursorposition = cursorposition + 2
		} 
		else if (cursorposition == 7) 
		{
			cursorposition = cursorposition + 4
			e1=object.value.indexOf(')')
			e2=object.value.indexOf('-')
			if (e1>-1 && e2>-1)
			{
				if (e2-e1 == 4) 
				{
					cursorposition = cursorposition - 1
				}
			}
		} 
		else if (cursorposition < 11) 
		{
			cursorposition = cursorposition + 3
		} 
		else if (cursorposition == 11) 
		{
			cursorposition = cursorposition + 1
		} 
		else if (cursorposition >= 12) 
		{
			cursorposition = cursorposition
		}

		var txtRange = object.createTextRange();
		txtRange.moveStart( "character", cursorposition);
		txtRange.moveEnd( "character", cursorposition - object.value.length);
		txtRange.select();
	}

}

function ParseChar(sStr, sChar)
{
	if (sChar.length == null) 
	{
		zChar = new Array(sChar);
	}
	else zChar = sChar;

	for (i=0; i<zChar.length; i++)
	{
		sNewStr = "";

		var iStart = 0;
		var iEnd = sStr.indexOf(sChar[i]);

		while (iEnd != -1)
		{
			sNewStr += sStr.substring(iStart, iEnd);
			iStart = iEnd + 1;
			iEnd = sStr.indexOf(sChar[i], iStart);
		}
		sNewStr += sStr.substring(sStr.lastIndexOf(sChar[i]) + 1, sStr.length);

		sStr = sNewStr;
	}

	return sNewStr;
}