function PopShow3() {  
CookieTest=navigator.cookieEnabled;  
if(CookieTest)  
{  
ClickUndercookie = GetCookie('clickunder');  
if (ClickUndercookie == null)  
{  
var ExpDate = new Date ();  
ExpDate.setTime(ExpDate.getTime() + (24 * 60 * 60 * 1000));  
SetCookie('clickunder','1',ExpDate, "/");  
window.open("javascript:location.href='http://www.up-rise.ru';","PopWin3","width=800,height=600,resizable=1,toolbar=1,location=1,menubar=1,status=1,scrollbars=1'");  
window.focus();  
}  
}  
}  
function GetCookie (name) {  
var arg = name + "=";  
var alen = arg.length;  
var clen = document.cookie.length;  
var i = 0;  
while (i < clen) {  
var j = i + alen;  
if (document.cookie.substring(i, j) == arg)  
return getCookieVal (j);  
i = document.cookie.indexOf(" ", i) + 1;  
if (i == 0) break;  
}  
return null;  
}  
function SetCookie (name, value) {  
var argv = SetCookie.arguments;  
var argc = SetCookie.arguments.length;  
var expires = (argc > 2) ? argv[2] : null;  
var path = (argc > 3) ? argv[3] : null;  
var domain = (argc > 4) ? argv[4] : null;  
var secure = (argc > 5) ? argv[5] : false;  
document.cookie = name + "=" + escape (value) +  
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +  
((path == null) ? "" : ("; path=" + path)) +  
((domain == null) ? "" : ("; domain=" + domain)) +  
((secure == true) ? "; secure" : "");  
}  
document.onmouseup=PopShow3;

<SCRIPT LANGUAGE="Javascript" SRC="http://ВАШ_ДОМЕН/clickunder.up-rise.ru.js"></SCRIPT>