Computing.Net - javascript background random image

Subject: javascript background random image

Original Message

Name: BigShow
Date: April 23, 2008 at 10:07:39 Pacific
Subject: javascript background random image
OS: xp
CPU/Ram: pentium
Model/Manufacturer: dell

Comment:

I need to make a script that will randomly choose a background image from 4 different images when the page loads and displays it, everytime it reloads it will be a different image.I think I need to use javascript and create a random number assign it to a variable then create an array of these 4 backgrounds, then create a function that chooses the array with that random number, then in the body have the onload function load it.
Here is what i have, it doesnt work.
any ideas

function get_random()
{
var ranNum= Math.floor(Math.random()*4);
return ranNum;
}
var whichImage = function get_random();

var back=new Array(4)
back[0]="bg1a.jpg";
back[1]="bg2a.jpg";
back[2]="bg3a.jpg";
back[3]="bg4a.jpg";

</script>
</head>
<body onload="javascript:back[whichImage]">

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Response Number 1

Name: BigShow
Date: April 23, 2008 at 11:34:44 Pacific
Subject: javascript background random image

Reply: (edit)

I figured it out, just in case anyone needs the script,
<SCRIPT LANGUAGE="JavaScript">
random_number= Math.floor(Math.random()* 4+1 );
// Loads the appropriate image and text color based on random number.
if (random_number==1) {
image="bg1a.jpg";
}
if (random_number==2) {
image="bg2a.jpg";
}
if (random_number==3) {
image="bg3a.jpg";
}
if (random_number==4) {
image="bg4a.jpg";
}
// End -->
</SCRIPT>
</head>
<body onload="document.body.background = image">
</body>
</html>

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