Mascara para qualquer tipo de campo

Uutilizada no evento onkeypress

HORA: return txtBoxFormat(this.form, this.name, '99:99', event);
CEP: return txtBoxFormat(this.form, this.name, '99999-999', event);
TELEFONE: return txtBoxFormat(this.form, this.name, '(99)9999-9999', event);
CPF: return txtBoxFormat(this.form, this.name, '999.999.999-99', event);


function txtBoxFormat(objForm, strField, 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 == {
return true;
}
}

sValue = objForm[strField].value;
// Limpa todos os caracteres de formatação que
// já estiverem no campo.
// toString().replace [transforma em sring e troca elementos por ""]
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( ":", "" );
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) == " ") || (sMask.charAt(i) == ".")) //Se for true utiliza elementos especiais aumenta a máscara if (bolMask) { sCod += sMask.charAt(i); mskLen++; //Caso false mostra o sValue(o q foi digitado) } else { sCod += sValue.charAt(nCount); nCount++; } i++; } objForm[strField].value = sCod; if (nTecla != { // backspace if (sMask.charAt(i-1) == "9") { // apenas números... return ((nTecla > 47) && (nTecla < 58)); } // números de 0 a 9
else { // qualquer caracter...
return true;
}
} else {
return true;
}
}