function getCookie(NameOfCookie){
if (document.cookie.length > 0) { 
begin = document.cookie.indexOf(NameOfCookie+"="); 
if (begin != -1) { 
begin += NameOfCookie.length+1; 
end = document.cookie.indexOf(";", begin);
if (end == -1) end = document.cookie.length;
return unescape(document.cookie.substring(begin, end));
} 
}
return null;
}

function setCookie(NameOfCookie, value, expiredays) {
var ExpireDate = new Date ();
ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));

document.cookie = NameOfCookie + "=" + escape(value) + 
((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
}

function delCookie (NameOfCookie) {
if (getCookie(NameOfCookie)) {
document.cookie = NameOfCookie + "=" +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}

function setWhite()
{
delCookie('setbg');
document.body.style.background="#000000 url(dhldbg.jpg) no-repeat fixed top center";
setCookie('setbg','whitebg',90);
}

function setRed()
{
delCookie('setbg');
document.body.style.background="#000000 url(dhldbgred.jpg) no-repeat fixed top center";
setCookie('setbg','redbg',90);
}

function setGreen()
{
delCookie('setbg');
document.body.style.background="#000000 url(dhldbggreen.jpg) no-repeat fixed top center";
setCookie('setbg','greenbg',90);
}

function setBlue()
{
delCookie('setbg');
document.body.style.background="#000000 url(dhldbgblue.jpg) no-repeat fixed top center";
setCookie('setbg','bluebg',90);
}

//window.location.reload();