// [dFilter] - A Numerical Input Mask for JavaScript
// Written By Dwayne Forehand - March 27th, 2003
// Please reuse & redistribute while keeping this notice.

var dFilterStep

function dFilterStrip (dFilterTemp, dFilterMask){
	dFilterMask = replace(dFilterMask,'#','');
	dFilterMask = replace(dFilterMask,'L','');
	for (dFilterStep = 0; dFilterStep < dFilterMask.length++; dFilterStep++){
	dFilterTemp = replace(dFilterTemp,dFilterMask.substring(dFilterStep,dFilterStep+1),'');
	}
	return dFilterTemp;
}

function dFilterMax (dFilterMask){
	dFilterTemp = dFilterMask;
	for (dFilterStep = 0; dFilterStep < (dFilterMask.length+1); dFilterStep++){
		if ((dFilterMask.charAt(dFilterStep)!='#') && (dFilterMask.charAt(dFilterStep)!='L')){
		dFilterTemp = replace(dFilterTemp,dFilterMask.charAt(dFilterStep),'');
		}
	}
	return dFilterTemp.length;
}

function dFilter(e, textbox, dFilterMask)
{
/*
* KEYS
*
* 9 - TAB
* 8 - BACKSPACE
*
*/

var key;
var strippedMask;

if(window.event) // IE
{
key = window.event.keyCode;
}
else if(e.which) // Netscape/Firefox/Opera
{
key = e.which;
}

dFilterNum = dFilterStrip(textbox.value, dFilterMask);
strippedMask = dFilterStrip(dFilterMask, dFilterMask);

if (key!=9 && key!=8 && key!=13){

if( strippedMask.charAt(dFilterNum.length) == '#'){
if(!( ( key>47&&key<58 ) || ( key>95&&key<106 ) )){
alert('Write a Number!');
key = '*';
}
}

else if(strippedMask.charAt(dFilterNum.length) == 'L'){
if(!(key>64 && key<91)){
alert('Write a Letter!');
key = '*';
}
}
}

if (key==9){
return true;
}
else if (key==8 && dFilterNum.length!=0){
dFilterNum = dFilterNum.substring(0,dFilterNum.length-1);
}
else if((key>64&&key<91) && dFilterNum.length<dFilterMax(dFilterMask) ){
dFilterNum=dFilterNum+String.fromCharCode(key);
}
else if ( ((key>47&&key<58)||(key>95&&key<106)) && dFilterNum.length<dFilterMax(dFilterMask) ){

if( key>47&&key<58 ){
dFilterNum=dFilterNum+String.fromCharCode(key);
}
if( key>95&&key<106 ){

var aux = 0;
switch(key){
case 96:
aux = 48;
break;
case 97:
aux = 49;
break;
case 98:
aux = 50;
break;
case 99:
aux = 51;
break;
case 100:
aux = 52;
break;
case 101:
aux = 53;
break;
case 102:
aux = 54;
break;
case 103:
aux = 55;
break;
case 104:
aux = 56;
break;
case 105:
aux = 57;
break;
}
dFilterNum=dFilterNum+String.fromCharCode(aux);
}
}

var dFilterFinal='';
for (dFilterStep = 0; dFilterStep < dFilterMask.length; dFilterStep++)
{
if (dFilterMask.charAt(dFilterStep)=='#' || dFilterMask.charAt(dFilterStep)=='L')
{
if (dFilterNum.length!=0)
{
dFilterFinal = dFilterFinal + dFilterNum.charAt(0);
dFilterNum = dFilterNum.substring(1,dFilterNum.length);
}
else
{
dFilterFinal = dFilterFinal + "";
}
}
else
{
dFilterFinal = dFilterFinal + dFilterMask.charAt(dFilterStep);
}
// dFilterTemp = replace(dFilterTemp,dFilterMask.substring(dFilterStep,dFilterStep+1),'');
}

textbox.value = dFilterFinal;
return false;
}

function replace(fullString,text,by) {
// Replaces text with by in string
var strLength = fullString.length, txtLength = text.length;
if ((strLength == 0) || (txtLength == 0)) return fullString;

var i = fullString.indexOf(text);
if ((!i) && (text != fullString.substring(0,txtLength))) return fullString;
if (i == -1) return fullString;

var newstr = fullString.substring(0,i) + by;

if (i+txtLength < strLength)
newstr += replace(fullString.substring(i+txtLength,strLength),text,by);

return newstr;
}