document.onselectstart=new Function ('return false');
//configuracion
var numero = 40 ;				//numero de copos
var velocidad = 3 ;				//velocidad a la que caen
var imagennieve = "images/nieve.gif";	//imagen para el copito de nieve

//deteccion navegadores
var ns4arriba = (document.layers) ? 1 : 0;
var ie4arriba = (document.getElementById) ? 1 : 0;

var dx, xp, yp;
var am, stx, sty;
var i, doc_ancho = 300, doc_alto = 300;

function nieva() {
     if (ns4arriba) {
     	doc_ancho = self.innerWidth;
     	doc_alto = self.innerHeight;
     } else if (ie4arriba) {
     	doc_ancho = document.body.clientWidth;
     	doc_alto = document.body.clientHeight;
     }
     
     dx = new Array();
     xp = new Array();
     yp = new Array();
     am = new Array();
     stx = new Array();
     sty = new Array();
     
    for (i = 0; i < numero; ++ i) {
     	dx[i] = 0;
     	xp[i] = Math.random()*(doc_ancho-50);
     	yp[i] = Math.random()* doc_alto;
     	am[i] = Math.random()* 20;
     	stx[i] = 0.02 + Math.random()/10;
     	sty[i] = 0.7 + Math.random();
     	if (ns4arriba) {
     		document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
     		document.write("top=\"15\" visibility=\"show\"><img src=\"");
     		document.write(imagennieve + "\" border=\"0\"></layer>");
     	} else if (ie4arriba) {
     		document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
     		document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
     		document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"");
     		document.write(imagennieve + "\" border=\"0\"></div>");
     	}
    }
     if (ns4arriba) nieve_netscape();
     else 	nieve_explorer();
}

function nieve_netscape() {
	for (i = 0; i < numero; ++ i) {
		yp[i] += sty[i];
		if (yp[i] > doc_alto) {
			xp[i] = Math.random()*(doc_ancho-am[i]-30);
			yp[i] = 0;
			stx[i] = 0.02 + Math.random()/10;
			sty[i] = 0.7 + Math.random();
			doc_ancho = self.innerWidth;
			doc_alto = self.innerHeight;
		}
		dx[i] += stx[i];
		document.layers["dot"+i].top = yp[i];
		document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
	}
	setTimeout("nieve_netscape()", velocidad);
}

function nieve_explorer() {
	for (i = 0; i < numero; ++ i) {
		yp[i] += sty[i];
	
		if (yp[i] > (doc_alto-10)) {
			xp[i] = Math.random()*(doc_ancho-am[i]-30);
			yp[i] = 0;
			stx[i] = 0.02 + Math.random()/10;
			sty[i] = 0.7 + Math.random();
			doc_ancho = document.body.clientWidth;
			doc_alto = document.body.clientHeight;
		}
		dx[i] += stx[i];
		document.getElementById("dot"+i).style.top = yp[i];
		document.getElementById("dot"+i).style.left = xp[i] + am[i]*Math.sin(dx[i]);
	}
	setTimeout("nieve_explorer()", velocidad);
}
//Funcion desliza texto barra inferior
var txt="";
	var longitud=100;
	var pos=0;
	for (i=1; i<(longitud); i++)
	{
	txt +="";
	}
	txt +="";
	longitud=txt.length;
function desliza()
	{
	if (pos==longitud) pos=-40;
	var msg=txt.substring(pos, longitud);
	window.status=msg;
	pos++;
	setTimeout("desliza()",50);
	}

function abrirventana(url)
{
window.open (url,'masinfo','toolbar=no,scrollbars=yes,location=no,directories=no,status=no,height=680,width=400,top=5,left=15, resizable=yes, menubar=no');
}

function enviardatos()
{
alert ('Usted no es un usuario registrado');
}

function abrirventana2(url)
{
window.open (url,'caracteristicas','toolbar=no,scrollbars=yes,location=no,directories=no,status=no,height=200,width=200,top=200,left=400, resizable=yes, menubar=no');
}

function abrirventana3(url)
{
window.open (url,'aviso','toolbar=no,scrollbars=yes,location=no,directories=no,status=no,height=400,width=400,top=200,left=400, resizable=yes, menubar=no');
}
function ventanacliente(url)
{
window.open (url,'prueba','toolbar=no,scrollbars=yes,location=no,directories=no,status=no,height=600,width=1015,top=75,left=0, resizable=yes, menubar=no');
}
function ventana(url)
{
window.open (url,'ventana','toolbar=no,scrollbars=yes,location=no,directories=no,status=no,height=600,width=1015,top=75,left=0, resizable=yes, menubar=no');
}