var Ads = 20;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % Ads;
ad +=1;


if (ad==1) {
BG="header24";
}

if (ad==2) {
BG="header23";
}

if (ad==3) {
BG="header3";
}

if (ad==4) {
BG="header28";
}

if (ad==5) {
BG="header28";
}

if (ad==6) {
BG="header29";
}

if (ad==7) {
BG="header7";
}


if (ad==8) {
BG="header8";
}

if (ad==9) {
BG="header22";
}

if (ad==10) {
BG="header10";
}

if (ad==11) {
BG="header11";
}

if (ad==12) {
BG="header12";
}

if (ad==13) {
BG="header29";
}

if (ad==14) {
BG="header14";
}

if (ad==15) {
BG="header15";
}


if (ad==16) {
BG="header16";
}

if (ad==17) {
BG="header23";
}

if (ad==18) {
BG="header18";
}

if (ad==19) {
BG="header24";
}

if (ad==20) {
BG="header21";
}





document.write('<table width=\"800\" height=\"150\" cellpadding=\"0\" cellspacing=\"0\">');
document.write('<tr><td width=\"160\">');
document.write('<img src=\"http://www.sierralarana.com/images/slr-logo.gif\" alt=\"Sierra La Rana\" width=\"160\" height=\"150\">');
document.write('</td>');
document.write('<td align=\"right\" valign=\"top\" width=\"640\" height=\"150\" background=\"http://www.sierralarana.com/new/header/' + BG + '.jpg\" width=\"640\" height=\"150\">');
document.write('<a href=\"development-of-distinction.php\"><img src=\"http://www.sierralarana.com/images/ida-logo-small.gif\" width=\"75\" alt=\"Awarded the Development of Distinction International Dark-Sky Association\" border=\"0\"></a>');
document.write('</td></tr></table>');

if (navigator.Appname=="Internet Explorer"){
   alert('Sorry! You cannot view the banners on this site with Internet Explorer!');
}