teşekkürler undefined sorunumun çözümünü buldum. kullanmak isteyenler olursa diye vereyim.

Alıntı
Part One:

Click Here to select the code. Use Control-C to copy it to your clipboard.

Paste this part of the code into the <head> section of your page.

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<script language="JavaScript">
<!--
// ==============================================
// Copyright 2003 by jsCode.com
// Source: jsCode.com
// Author: etLux
// Free for all; but please leave in the header.
// ==============================================

// Set up the image files to be used.
var theImages = new Array() // do not change this
// To add more image files, continue with the
// pattern below, adding to the array. Rememeber
// to increment the theImages[x] index!

theImages[0] = '100.jpg'
theImages[1] = '200.jpg'
theImages[2] = '300.jpg'
theImages[3] = '400.jpg'
theImages[4] = '500.jpg'

// ======================================
// do not change anything below this line
// ======================================

var j = 0
var p = theImages.length;

var preBuffer = new Array()
for (i = 0; i < p; i++){
preBuffer[i] = new Image()
preBuffer[i].src = theImages[i]
}

var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+theImages[whichImage]+'">');
}

//-->
</script>

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Part Two:

Click Here to select the code. Use Control-C to copy it to your clipboard.

Paste this part of the code into the <body> section of your page where you want the images to appear.
.

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<script language="JavaScript">
<!--
// ==============================================
// Copyright 2003 by jsCode.com
// Source: jsCode.com
// Author: etLux
// Free for all; but please leave in the header.
// ==============================================
showImage();
//-->
</script>