function hide_element(id_element){
    document.getElementById(id_element).style.display = "none";
}

function show_element(id_element){
    document.getElementById(id_element).style.display = "block";
}

function toggle_element(id_element){
    if (document.getElementById(id_element).style.display == "block"){
        hide_element(id_element);
    }else {
        show_element(id_element);
    }
}

function popup(url,ancho,largo,barras){
	var opciones="toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars="+barras+",resizable=no,width="+ancho+",height="+largo+",top=50,left=50";
	window.open(url,"",opciones);
}

function count_char(max_char,text,id_label){
    if (text != null){
        var writed = text.value.length;
        var remaining = max_char - writed;

        if (remaining <= 0){            
            remaining = 0;
        }

        if (id_label.length > 0 && remaining > 0){
            document.getElementById(id_label).innerHTML = 'Restan '+remaining+' caracteres';
        }

        if (writed >  max_char){
            text.value = text.value.substring(0,max_char);
        }
    }
}

function reload_captcha(id_captcha,url_captcha){
    document.getElementById(id_captcha).src = url_captcha+'?'+Math.random();
}

function redirect_select(targ,selObj,restore){ //v1.0
    eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
    if (restore) selObj.selectedIndex=0;
}

function randOrd(){
    return (Math.round(Math.random())-0.5);
}