function Limpar(valor, validos) {
	// retira caracteres invalidos da string
	var result = "";
	var aux;
	for (var i=0; i < valor.length; i++) {
		aux = validos.indexOf(valor.substring(i, i+1));
		if (aux>=0) {
		result += aux;
		}
	}
return result;
}

//Formata número tipo moeda usando o evento onKeyDown

function Formata(campo,tammax,teclapres,decimal) {
var tecla = teclapres.keyCode;
vr = Limpar(campo.value,"0123456789");
tam = vr.length;
dec=decimal

if (tam < tammax && tecla != 8){ tam = vr.length + 1 ; }

if (tecla == 8 )
{ tam = tam - 1 ; }

if ( tecla == 8 || tecla >= 48 && tecla <= 57 || tecla >= 96 && tecla <= 105 )
	{

	if ( tam <= dec )
		{ 
		campo.value = vr ; 
		}	
	if ( (tam > dec) && (tam <= 5) )
		{
		campo.value = vr.substr( 0, tam - 2 ) + "," + vr.substr( tam - dec, tam ) ; 
		}
	if ( (tam >= 6) && (tam <= 8) )
		{
		campo.value = vr.substr( 0, tam - 5 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - dec, tam ) ; 
		}
	if ( (tam >= 9) && (tam <= 11) )
		{
		campo.value = vr.substr( 0, tam - 8 ) + "." + vr.substr( tam - 8, 3 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - dec, tam ) ; 
		}
	if ( (tam >= 12) && (tam <= 14) )
		{
		campo.value = vr.substr( 0, tam - 11 ) + "." + vr.substr( tam - 11, 3 ) + "." + vr.substr( tam - 8, 3 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - dec, tam ) ; 
		}
	if ( (tam >= 15) && (tam <= 17) )
		{
		campo.value = vr.substr( 0, tam - 14 ) + "." + vr.substr( tam - 14, 3 ) + "." + vr.substr( tam - 11, 3 ) + "." + vr.substr( tam - 8, 3 ) + "." + vr.substr( tam - 5, 3 ) + "," + vr.substr( tam - 2, tam ) ;
		}
	} 

}