function txtBoxFormat(objeto, sMask, evtKeyPress) {
	var i, nCount, sValue, fldLen, mskLen,bolMask, sCod, nTecla;


if(document.all) { // Internet Explorer
	nTecla = evtKeyPress.keyCode;
} else if(document.layers) { // Nestcape
	nTecla = evtKeyPress.which;
} else {
	nTecla = evtKeyPress.which;
	if (nTecla == 8) {
		return true;
	}
}

	sValue = objeto.value;

	sValue = sValue.toString().replace( "-", "" );
	sValue = sValue.toString().replace( "-", "" );
	sValue = sValue.toString().replace( ".", "" );
	sValue = sValue.toString().replace( ".", "" );
	sValue = sValue.toString().replace( "/", "" );
	sValue = sValue.toString().replace( "/", "" );
	sValue = sValue.toString().replace( ":", "" );
	sValue = sValue.toString().replace( ":", "" );
	sValue = sValue.toString().replace( "(", "" );
	sValue = sValue.toString().replace( "(", "" );
	sValue = sValue.toString().replace( ")", "" );
	sValue = sValue.toString().replace( ")", "" );
	sValue = sValue.toString().replace( " ", "" );
	sValue = sValue.toString().replace( " ", "" );
	fldLen = sValue.length;
	mskLen = sMask.length;

	i = 0;
	nCount = 0;
	sCod = "";
	mskLen = fldLen;

	while (i <= mskLen) {
		bolMask = ((sMask.charAt(i) == "-") || (sMask.charAt(i) == ".") || (sMask.charAt(i) == "/") || (sMask.charAt(i) == ":"))
		bolMask = bolMask || ((sMask.charAt(i) == "(") || (sMask.charAt(i) == ")") || (sMask.charAt(i) == " "))

	if (bolMask) {
		sCod += sMask.charAt(i);
		mskLen++; }
	else {
		sCod += sValue.charAt(nCount);
		nCount++;
	}

	i++;
	}

	objeto.value = sCod;

	if (nTecla != 8) {
		if (sMask.charAt(i-1) == "9") {
			return ((nTecla > 47) && (nTecla < 58)); }
		else {
			return true;
		}
	}
	else {
		return true;
	}
}