
<!-- 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/content/HowToAutoFormatTelephoneNumber.aspx -->

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;
}