function creaAJAX() {
	var XMLHttpRequestObject=false;
	
	if(window.XMLHttpRequest) {
		XMLHttpRequestObject=new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		XMLHttpRequestObject=new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	return XMLHttpRequestObject;
}

function cargaimagen(idimg, divID) {
	if(ajax) {
		var obj=document.getElementById(divID);
			
		ajax.open("GET", idimg);
		ajax.onreadystatechange=function() {
			if(ajax.readyState==4) {
				obj.innerHTML=ajax.responseText;
			} else {
				obj.innerHTML="<img src=\"img/cargando.gif\" alt=\"cargando\" style=\"margin:100px 150px 0 0\" />";
			}
		}
		ajax.send(null);
	}
}

function cargavideo(vid, divID) {
	if(ajax) {
		var obj=document.getElementById(divID);
			
		ajax.open("GET", vid);
		ajax.onreadystatechange=function() {
			if(ajax.readyState==4) {
				obj.innerHTML=ajax.responseText;
			} else {
				obj.innerHTML="<img src=\"img/cargando.gif\" alt=\"cargando\" />";
			}
		}
		ajax.send(null);
	}
}

function obtenerdatos(datos, divID) {
	if(ajax) {
		if(divID=="galerias_contenidos") { 
			var obj_=document.getElementById("imagenes_contenidos");
		}
		var obj=document.getElementById(divID);
			
		ajax.open("GET", datos);
		ajax.onreadystatechange=function() {
			if(ajax.readyState==4) {
				obj.innerHTML=ajax.responseText;
				if(divID=="galerias_contenidos") {
					obj_.innerHTML="";
				}
			} else {
				obj.innerHTML="<img src=\"../img/cargando.gif\" alt=\"cargando\" />";
			}
		}
		ajax.send(null);
	}
}

function getTamanioPag(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight) 
	return arrayPageSize;
}

function mostrarCapa(idcapa) {
	document.getElementById(idcapa).style.visibility="visible";
	
	var arrayPageSize = getTamanioPag();
	document.getElementById("capafondo").style.width=arrayPageSize[0];
	document.getElementById("capafondo").style.height=arrayPageSize[1];
	document.getElementById("capafondo").style.visibility="visible";
}

function ocultarCapa(idcapa) {
	document.getElementById(idcapa).style.visibility="hidden";
	document.getElementById("capafondo").style.visibility="hidden";
}

function cargaDatosInsGal(orden, seccion) {
	document.getElementById('ordengaleria').value=orden;
	//document.getElementById('idseccion_gal').value=seccion;
	document.getElementById('divgaleriaizq').style.visibility="";
	document.getElementById('divgaleriadch').style.visibility="";
	
	var listasecciones=document.getElementById('idseccion_gal');
	for(i=0; i<listasecciones.options.length; i++) {
		if(listasecciones.options[i].value==seccion) {
			listasecciones.options[i].selected=true;
		}
	}
}

function cargaDatosEditGal(id, seccion, orden) {
	document.getElementById('editgaleria').value=id;
	document.getElementById('ordengaleria').value=orden;
	document.getElementById('botongaleria').value="Guardar datos";
	document.getElementById('divgaleriaizq').style.visibility="hidden";
	document.getElementById('divgaleriadch').style.visibility="hidden";
	
	document.getElementById('idseccionANT_gal').value=seccion;
	var listasecciones=document.getElementById('idseccion_gal');
	for(i=0; i<listasecciones.options.length; i++) {
		if(listasecciones.options[i].value==seccion) {
			listasecciones.options[i].selected=true;
		}
	}
}

function cargaDatosInsImg(orden, seccion, galeria) {
	document.getElementById('ordenimagen').value=orden;
	document.getElementById('idseccion_img').value=seccion;
	document.getElementById('idgaleria').value=galeria;
	document.getElementById('divimagenizq').style.visibility="";
	document.getElementById('divimagendch').style.visibility="";
}

function cargaDatosEditImg(id, seccion, galeria, orden) {
	document.getElementById('editimagen').value=id;
	document.getElementById('idseccion_img').value=seccion;
	document.getElementById('idgaleria').value=galeria;
	document.getElementById('ordenimagen').value=orden;
	document.getElementById('botonimagen').value="Guardar datos";
	document.getElementById('divimagenizq').style.visibility="hidden";
	document.getElementById('divimagendch').style.visibility="hidden";
}