/*
	função para fazer as máscaras da entrada do formulário de acordo com o algaritimo que você quiser
	usar a função desta maneira, colocar o nome do formulario e o nome do campo
	onkeypress="return mascara(this, '999-999999', event);"
*/
function mascara(objForm, sMask, evtKeyPress)
{

    var whichCode = (window.Event) ? evtKeyPress.which : evtKeyPress.keyCode;

    if (whichCode == 8){ // tecla backspace
        return true;
    }

     var i, nCount, sValue, fldLen, mskLen,bolMask, sCod, nTecla;

     if (evtKeyPress.keyCode) nTecla = evtKeyPress.keyCode; //internet explorer
	 else if (evtKeyPress.which) nTecla = evtKeyPress.which; // mozilla firefox

     sValue = objForm.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( " ", "" );
     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) == "/"))
		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++;
	}

	objForm.value = sCod;

	if (nTecla != 8) { // backspace
		if (sMask.charAt(i-1) == "9") // apenas números...
		{
			return ((nTecla > 47) && (nTecla < 58)); // números de 0 a 9
		}
		else // qualquer caracter...
		{
			return false;
		}
	}
	else
	{
		return true;
	}
}