// Borrar texto defecto input de un form
function clearText(thefield){
if (thefield.defaultValue==thefield.value)
thefield.value = ""
} 

// Compartir en Facebook
function fbs_click() {
u=location.href;
t=document.title;
window.open('http://www.facebook.com/sharer.php?u='+encodeURIComponent(u)+'&t='+encodeURIComponent(t),'sharer','toolbar=0,status=0,width=500,height=500');
return false;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function setWinSize(){
 var IMG = document.getElementById('imgMuestra');
 w = IMG.width + 20;
 h = IMG.height + 80;
 window.resizeTo(w,h);
}

// Click Toggle - Ampliar la nota
clickMenu = function(menu,element,cname) {
	var getEls = document.getElementById(menu).getElementsByTagName(element);

	for (var i=0; i<getEls.length; i++) {
			getEls[i].onclick=function() {
			if ((this.className.indexOf(cname))!=-1)
			{
			if ((this.className.indexOf('click'))!=-1) {
				this.className=this.className.replace("click", "");;
				}
				else {
				this.className+=" click";
				}
			}
		}
	}
}

// Valida formato fecha
function esFechaValida(fecha){
    if (fecha != undefined && fecha.value != "" ){
        if (!/^\d{2}\/\d{2}\/\d{4}$/.test(fecha.value)){
            alert("formato de fecha no válido, tiene que ser (dd/mm/aaaa)");
            return false;
        }
        var dia  =  parseInt(fecha.value.substring(0,2),10);
        var mes  =  parseInt(fecha.value.substring(3,5),10);
        var anio =  parseInt(fecha.value.substring(6),10);
 
    switch(mes){
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            numDias=31;
            break;
        case 4: case 6: case 9: case 11:
            numDias=30;
            break;
        case 2:
            if (comprobarSiBisisesto(anio)){ numDias=29 }else{ numDias=28};
            break;
        default:
            alert("Fecha incorrecta");
            return false;
    }
        if (dia>numDias || dia==0){
            alert("Fecha incorrecta");
            return false;
        }
        return true;
    }
}


function comprobarSiBisisesto(anio){
if ( ( anio % 100 != 0) && ((anio % 4 == 0) || (anio % 400 == 0))) {
    return true;
    }
else {
    return false;
    }
}

// Confirma acción
function confirmar ( mensaje ) {
return confirm( mensaje );
} 

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);