function openwin(theURL,winName,features){
	aux=features.split(',');
	ancho=aux[0];
	aux=ancho.split('=');
	ancho=aux[1]*1;
	pos=screen.width;
	pos=(pos/2)-(ancho/2)-10;
	y=screen.height;
	y=256;
	features=features+',left='+pos+', top='+y;
	newwin=window.open(theURL,winName,features);
	if (!newwin.opener)
		newwin.opener = self;
	newwin.name=winName;
	newwin;
};

function campo_nume(evt){ 
	var nav4 = window.Event ? true : false;
// NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57 
	var key = nav4 ? evt.which : evt.keyCode; 
	return (key <= 46 || (key >= 48 && key <= 57));
}

function acceptNum(evt){ 
	var nav4 = window.Event ? true : false;
	var key = nav4 ? evt.which : evt.keyCode; 
	return (key<13 || key==46 || (key >= 48 && key <= 57));
}

function controlar_numero(elemento){
	temp=elemento.value;
	if (isNaN(temp)){
		elemento.value='';
	}
}