/* METODOS PARA CHAMAR A FUNCAO
Data:<input type="text" size="20" onkeypress="return txtBoxFormat(this, '99/99/9999', event);">
RG:<input type="text" size="20" onkeypress="return txtBoxFormat(this, '99.999.999-9', event);">
Telefone:<input type="text" size="20" onkeypress="return txtBoxFormat(this, '(99)9999-9999', event);">
Código:<input type="text" size="20" onkeypress="return txtBoxFormat(this, '99-999', event);">
*/

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;

    // Limpa todos os caracteres de formatação que
    // já estiverem no campo.
    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)// backspace
	{ 
		if(sMask.charAt(i-1) == "9") // apenas números...
		{
	    	return ((nTecla > 47) && (nTecla < 58)); 
		}
      	else
		{ // qualquer caracter...
        	return true;
      	}
    }
    else
	{
      return true;
    }
}