<!--//
function tecla(e){

	var key = window.event ? e.keyCode : e.which;
	var keychar = String.fromCharCode(key);
	if (key==46) { return key = 46; } //ponto
	if (key==45) { return key = 45; } //menos
	if (key==8) { return key = 8; } //backspace
	if (key <48 | key > 57){ return key = false; }

}
//-->