function fade(elementid){
		document.getElementById(elementid).style.opacity='0.4';
	}
	function unfade(elementid){
		document.getElementById(elementid).style.opacity='1';
	}
	function getDocHeight() {
    	var D = document;
    	return Math.max(
    	    Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),
    	    Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),
    	    Math.max(D.body.clientHeight, D.documentElement.clientHeight)
		);
	}
	function getDocWidth() {
	    var D = document;
	    return Math.max(
	        Math.max(D.body.scrollWidth, D.documentElement.scrollWidth),
	        Math.max(D.body.offsetWidth, D.documentElement.offsetWidth),
	        Math.max(D.body.clientWidth, D.documentElement.clientWidth)
	    );
	}
	function paginas(){
		document.getElementById("pane1").className = "paneSelected";
		document.getElementById("pane2").className = "paneUnselected";
		document.getElementById("pane3").className = "paneUnselected";
		
		document.getElementById("divNavPag").style.display = "block";
		document.getElementById("divComentarios").style.display = "none";
		document.getElementById("divCuadernos").style.display = "none";
	}
	
	function comentarios(){
		document.getElementById("pane1").className = "paneUnselected";
		document.getElementById("pane2").className = "paneSelected";
		document.getElementById("pane3").className = "paneUnselected";
		
		document.getElementById("divNavPag").style.display = "none";
		document.getElementById("divComentarios").style.display = "block";
		document.getElementById("divCuadernos").style.display = "none";
		
	}
	
	function cuadernos(){
		document.getElementById("pane1").className = "paneUnselected";
		document.getElementById("pane2").className = "paneUnselected";
		document.getElementById("pane3").className = "paneSelected";
		
		document.getElementById("divNavPag").style.display = "none";
		document.getElementById("divComentarios").style.display = "none";
		document.getElementById("divCuadernos").style.display = "block";
		
	}