why not run random background image

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why not run random background image

img1.css

body {
	background-image: url(image1.jpg);
	background-color:#4E0000;
	background-position: left top;
	background-repeat:no-repeat;
}

img2.css

body {
	background-image: url(image2.jpg);
	background-color:#4E0000;
	background-position: left top;
	background-repeat:no-repeat;
}

img3.css

body {
	background-image: url(image3.jpg);
	background-color:#4E0000;
	background-position: left top;
	background-repeat:no-repeat;
}

img4.css

body {
	background-image: url(image4.jpg);
	background-color:#4E0000;
	background-position: left top;
	background-repeat:no-repeat;
}

img5.css

body {
	background-image: url(image5.jpg);
	background-color:#4E0000;
	background-position: left top;
	background-repeat:no-repeat;
}

HTML

<link href="img2.css" rel="stylesheet" type="text/css">
<link href="img1.css" title="img1" rel="alternate stylesheet" type="text/css">
<link href="img3.css" title="img3" rel="alternate stylesheet" type="text/css">
<link href="img4.css" title="img4" rel="alternate stylesheet" type="text/css">
<link href="img5.css" title="img5" rel="alternate stylesheet" type="text/css">
<link href="img6.css" title="img6" rel="alternate stylesheet" type="text/css">
<script type="text/javascript" language="javascript">

<!--

//"manual" or "random"
var manual_or_random="manual"
//"eachtime", "sessiononly", or "x days
var randomsetting="1 days" (replace x with desired integer)". Only applicable if mode is random.



function getCookie(Name)
{
var re=new RegExp(Name+"=[^;]+", "i");
//construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1]
//return its value
return null
}

function setCookie(name, value, days) {
var expireDate = new Date()
//set "expstring" to either future or past date, to set or delete
//cookie, respectively
var expstring=(typeof days!="undefined")? expireDate.setDate(expireDate.getDate()+parseInt(days)) : expireDate.setDate(expireDate.getDate()-5)
document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
}

function deleteCookie(name){
setCookie(name, "moot")
}


function setStylesheet(title, randomize)
{
//Main stylesheet switcher function. Second parameter if defined causes
//a random alternate stylesheet (including none) to be enabled
var i, cacheobj, altsheets=[""]
for(i=0; (cacheobj=document.getElementsByTagName("link")[i]); i++) {
if(cacheobj.getAttribute("rel").toLowerCase()=="alternate stylesheet" && cacheobj.getAttribute("title"))
{
//if this is an alternate stylesheet with title
cacheobj.disabled = true
altsheets.push(cacheobj)
//store reference to alt stylesheets inside array
if(cacheobj.getAttribute("title") == title)
//enable alternate stylesheet with title that matches parameter
cacheobj.disabled = false
//enable chosen style sheet
}
}
if (typeof randomize!="undefined"){
//if second paramter is defined, randomly enable an alt style sheet (includes non)
var randomnumber=Math.floor(Math.random()*altsheets.length)
altsheets[randomnumber].disabled=false
}
return (typeof randomize!="undefined" && altsheets[randomnumber]!="")? altsheets[randomnumber].getAttribute("title") : ""
//if in "random" mode, return "title" of randomly enabled alt stylesheet
}

function chooseStyle(styletitle, days){
//Interface function to switch style sheets plus save "title" attr of
//selected stylesheet to cookie
if (document.getElementById){
setStylesheet(styletitle)
setCookie("mysheet", styletitle, days)
}
}

function indicateSelected(element){
//Optional function that shows which style sheet is currently selected
//within group of radio buttons or select menu
if (selectedtitle!=null && (element.type==undefined || element.type=="select-one")){
//if element is a radio button or select menu
var element=(element.type=="select-one") ? element.options : element
for (var i=0; i<element.length; i++){
if (element[i].value==selectedtitle){
//if match found between form element value and cookie value
if (element[i].tagName=="OPTION")
//if this is a select menu
element[i].selected=true
else
//else if it's a radio button
element[i].checked=true
break
}
}
}
}

if (manual_or_random=="manual"){
//IF MANUAL MODE
var selectedtitle=getCookie("mysheet")
if (document.getElementById && selectedtitle!=null)
//load user chosen style sheet from cookie if there is one stored
setStylesheet(selectedtitle)
}
else if (manual_or_random=="random"){
//IF AUTO RANDOM MODE
if (randomsetting=="eachtime")
setStylesheet("", "random")
else if (randomsetting=="sessiononly"){
//if "sessiononly" setting
if (getCookie("mysheet_s")==null)
//if "mysheet_s" session cookie is empty
document.cookie="mysheet_s="+setStylesheet("", "random")+"; path=/"
//activate random alt stylesheet while remembering its "title" value
else
setStylesheet(getCookie("mysheet_s"))
//just activate random alt stylesheet stored in cookie
}
else if (randomsetting.search(/^[1-9]+ days/i)!=-1){
//if "x days" setting
if (getCookie("mysheet_r")==null || parseInt(getCookie("mysheet_r_days"))!=parseInt(randomsetting)){
//if "mysheet_r" cookie
setCookie("mysheet_r", setStylesheet("", "random"), parseInt(randomsetting))
//activate random alt stylesheet while remembering its "title" value
setCookie("mysheet_r_days", randomsetting, parseInt(randomsetting)) //Also remember the number of days to persist per the "x days" variable
}
else
setStylesheet(getCookie("mysheet_r"))
//just activate random alt stylesheet stored in cookie
}
}

if (document.images) {
pic2= new Image(1440,892);
pic2.src="/templates/transparent_bliss_1.5/images/sunset.jpg";
}
-->
</script>


<center>
<a href="javascript:chooseStyle('none',%2060)" checked="checked"><img src="thumb2.jpg" alt="background image 2" class="bgthumbs" border="0"></a>
<a href="javascript:chooseStyle('img1',%2060)"><img src="thumb1.jpg" alt="background image 1" class="bgthumbs" border="0"></a>
<a href="javascript:chooseStyle('img3',%2060)"><img src="thumb3.jpg" alt="background image 3" class="bgthumbs" border="0"></a>
<a href="javascript:chooseStyle('img4',%2060)"><img src="thumb4.jpg" alt="background image 4" class="bgthumbs" border="0"></a>
<a href="javascript:chooseStyle('img5',%2060)"><img src="thumb5.jpg" alt="background image 5" class="bgthumbs" border="0"></a>
<a href="javascript:chooseStyle('img6',%2060)"><img src="thumb6.jpg" alt="background image 6" class="bgthumbs" border="0"></a>
</center>

</center>




Random background does not work automatically