Javascript random ad code (image AD) _ ad code

Some random image advertisements, excluding flash advertisements, can be used for random display of advertisements.

<Script LANGUAGE = "Javascript"> <! -- // Banner rotator var tag1 = new Array (); var urlArray = new Array (); //************************************** ****************** // ****** START 6-6 ***** // urlArray [urlArray. length] =" http://s.jb51.net "; Tag1 [tag1.length] =" http://img.jb51.net/imgby/server.gif "; UrlArray [urlArray. length] =" http://www.jb51.net "; Tag1 [tag1.length] =" http://www.jb51.net /Images/logo.gif "; // ***** END 6-25 ***** // var adsAry_length = tag1.length; var now = new Date (); // MOD 20090522var sec = now. getSeconds (); // MOD 20090522 var ad = sec % adsAry_length; var sec = now. getTime (); var ad = rand (adsAry_length) var url = urlArray [ad-1]; var banner = tag1 [ad-1]; // DEL alert ("urlArray [" + (ad-1) + "] =" + urlArray [ad-1]) // DEL 20090522 if (ad <= tag1.length) {// DEL 20090522 url = urlArray [ad]; // DEL 20090522 banner = tag1 [ad]; // DEL 20090522} // DEL 20090522 document. write ('<center>'); document. writeln (''); document. writeln (''); // DEL 20090522 document. write ('<\ center> '); //************************************** * ************* // rnd () //************************************** * ************/function rnd () {var ia = 9301; var ic = 49297; var im = 233280; sec = (sec * ia + ic) % im; return sec/(im * 1.0 );}; //************************************** * ************* // rand (number) //************************************** * ************/function rand (number) {return Math. ceil (rnd () * number) ;}; // --> script
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]

There is a good random function code in it, but it is not clear. You can reply to a friend you know.

The Code is as follows:

Function rnd (){
Var ia = 9301;
Var ic = 49297;
Var im = 233280;
Sec = (sec * ia + ic) % im;
Return sec/(im * 1.0 );
};