var how_many_ads = 5;

var now = new Date()

var sec = now.getSeconds()

var ad = sec % how_many_ads;

ad +=1;



if (ad==1) {

version="1";

}

if (ad==2) {

version="2";

}

if (ad==3) {

version="3";

}

if (ad==4) {

version="4";

}

if (ad==5) {

version="5";

}





document.write('<img src="img_content/home_mainpic_' + version + '.jpg" width="567" height="226" alt="" border="0">');