function initRanString() {
   arg_length = initRanString.arguments.length;
   var i = Math.ceil(arg_length * Math.random() - 1);  
    return initRanString.arguments[i];
   }

// Program 1
link1 = "http://www.interda.ru/andrey/books.asp"
statusline1 = "http://www.interda.ru/andrey/books.asp"
image1 = "http://www.interdama.com/banners/andrey/"+initRanString(
'book_b1.gif',
'book_b2.gif',
'book_b3.gif'
)

// Program 2
link2 = "http://www.interda.ru/andrey/books.asp"
statusline2 = "http://www.interda.ru/andrey/books.asp"
image2 = "http://www.interdama.com/banners/andrey/"+initRanString(
'book_b1.gif',
'book_b2.gif',
'book_b3.gif'
)

// Program 3
link3 = "http://www.interda.ru/andrey/books.asp"
statusline3 = "http://www.interda.ru/andrey/books.asp"
image3 = "http://www.interdama.com/banners/andrey/"+initRanString(
'book_b1.gif',
'book_b2.gif',
'book_b3.gif'
)

   banner = new Array(
[link1,image1,statusline1],
[link2,image2,statusline2],
[link3,image3,statusline3]
)

     var randomnumber = Math.random() ;
      var i = Math.round( (banner.length -1) * randomnumber);

       var str1 =  "<a href=\"" +banner[i][0] + "\" "; 
       var str2 =  "onmouseover=\"window.status=\'" + banner[i][2] + "\'; return true\"  target=\"_top\" onClick=\"return true;\">";
       var str3 =  "<img src=\"" + banner[i][1] + "\" border=\"0\"></a>";

        document.write (str1 + str2 + str3);