function mascara(e,src,mask) {
	if(window.event) { 
		_TXT = e.keyCode; 
	} else 
		if(e.which) { 
		_TXT = e.which; 
	}
	//alert(_TXT);
	
	if(_TXT > 47 && _TXT < 58) {
		var i = src.value.length; 
		var saida = mask.substring(0,1); 
		var texto = mask.substring(i);
		if(texto.substring(0,1) != saida) { 
			src.value += texto.substring(0,1); 
		}
		return true; 
	} else { 
		if (_TXT != 8) {
			return false; 
		} else { 
			return true; 
		}
	}
	
}

function proximo(e, src, tamanho, proximo){
	if(window.event) { 
		_TXT = e.keyCode; 
	} else 
		if(e.which) { 
		_TXT = e.which; 
	}
	
	if(_TXT > 47 && _TXT < 58) {
		if(src.value.length == tamanho){
			proximo.focus();
		}
		return true; 
	} else { 
		if (_TXT != 8) { 
			return false; 
		} else { 
			return true; 
		}
	}

}