espero que esto te ayude:
Código HTML:
<html>
<head>
<title>Banner</title>
<SCRIPT language="JavaScript">
<!--
/* You can get this script and many others
by visiting JavaScript City at: http://www.javascriptcity.com . */
pic_width=468; /*change to match the height of all your images */
pic_height=60; /* change to match the width of all your images */
border_size=0; /* change to the border size you want on the images */
alignment=1; /* 0=left,1=center */
/* define image urls */
if (document.images)
{
pic1= new Image(pic_width,pic_height);
pic1.src="http://ads.peru.com/ads/ads/ban_arreglo_esplendor_gr.gif"; // 1
pic2= new Image(pic_width,pic_height);
pic2.src="http://ads.peru.com/ads/ads/ban_arreglo_flores_02_gr.gif"; // 2
pic3= new Image(pic_width,pic_height);
pic3.src="http://ads.peru.com/ads/ads/1_ban_familia.gif"; // 3
pic4= new Image(pic_width,pic_height);
pic4.src="http://ads.peru.com/ads/ads/ban_set_feliz_dia_mama_gr.gif"; // 4
pic5= new Image(pic_width,pic_height);
pic5.src="http://ads.colombia.com/adscol/ads/ban_20050103_iquiero_pq.jpg"; // 5
} // puedes ir agregando mas
/* define banner urls */
urlad1="http://www.forosdelweb.com/1";
urlad2="http://www.forosdelweb.com/2";
urlad3="http://www.forosdelweb.com/3";
urlad4="http://www.forosdelweb.com/4";
urlad5="http://www.forosdelweb.com/5";
/* puedes ir agregando mas /*
/* no need to edit past this point (unless you want to add more image and url slots) */
if (alignment==1)
{
cent_it="<CENTER>";
cent_it2="<\/CENTER>";
}
else
{
cent_it="";
cent_it2="";
}
function get_random(maxNum)
{
if (Math.random && Math.round)
{
var ranNum= Math.round(Math.random()*(maxNum-1));
ranNum+=1;
return ranNum;
}
else
{
today= new Date();
hours= today.getHours();
mins= today.getMinutes();
secn= today.getSeconds();
if (hours==19)
hours=18;
var ranNum= (((hours+1)*(mins+1)*secn)%maxNum)+1;
return ranNum;
}
}
function get_Image()
{
if (document.images)
{
var choose_one= get_random(5);
choose_one--;
var pics= new Array(5)
pics[0]=pic1.src;
pics[1]=pic2.src;
pics[2]=pic3.src;
pics[3]=pic4.src;
pics[4]=pic5.src;
var aurl= new Array(5)
aurl[0]=urlad1;
aurl[1]=urlad2;
aurl[2]=urlad3;
aurl[3]=urlad4;
aurl[4]=urlad5;
document.write(cent_it+"<A HREF='"+aurl[choose_one]+"'><IMG SRC='"+pics[choose_one]+"' width='"+pic_width+"' height='"+pic_height+"' border='"+border_size+"'></A>"+cent_it2);
}
}
//-->
</SCRIPT>
</head>
<body>
<SCRIPT language="JavaScript">
<!--
get_Image()
//-->
</SCRIPT>
<p>REF: http://www.javascriptcity.com/scripts/local/simage2.htm</p>
</body>
</html>
Saludos: