function footerArchivo(){
	
	//detector de browser y plataforma
	var d, dom, ie, ie4, ie5x, moz, mac, win, lin, old, ie5mac, ie5xwin, op;

	d = document;
	n = navigator;
	na = n.appVersion;
	nua = n.userAgent;
	win = ( na.indexOf( 'Win' ) != -1 );
	mac = ( na.indexOf( 'Mac' ) != -1 );
	lin = ( na.indexOf( 'Linux' ) != -1 );

	if ( !d.layers ){
		dom = ( d.getElementById );
		op = ( nua.indexOf( 'Opera' ) != -1 );
		konq = ( nua.indexOf( 'Konqueror' ) != -1 );
		saf = ( nua.indexOf( 'Safari' ) != -1 );
		moz = ( nua.indexOf( 'Gecko' ) != -1 );
		ie = ( d.all && !op );
		ie4 = ( ie && !dom );
		ie5x = ( d.all && dom );
		ie5mac = ( mac && ie5x );
		ie5xwin = ( win && ie5x );
	}

	if (ie || op || ie5mac)	{

		a = parseInt(document.all["cn1b"].scrollHeight);
		b = parseInt(document.all["cn2b"].scrollHeight);
		if(a<b) a=b;
		document.all['cn3'].style.top = a + 105;
		document.all['cn3'].style.visibility = "visible";
	
	} else if (dom && !op){

		a = document.body.scrollHeight;
		document.getElementById("cn3").style.top =  a;
		document.getElementById("cn3").style.visibility = "visible";

	}
	
}