I have searched for many it is the firefox blocked. Who can help me? Thanks

<script>

//Pop-under window- By JavaScript Kit
//Credit notice must stay intact for use
//Visit http://javascriptkit.com for this script

//specify page to pop-under
var popunder="http://yahoo.com"

//specify popunder window features
//set 1 to enable a particular feature, 0 to disable
var winfeatures="width=800,height=510,scrollbars=1,res izable=1,toolbar=1,location=1,menubar=1,status=1,d irectories=0"

//Pop-under only once per browser session? (0=no, 1=yes)
//Specifying 0 will cause popunder to load every time page is loaded
var once_per_session=0

///No editing beyond here required/////

function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) { // if cookie exists
offset += search.length
// set index of beginning of value
end = document.cookie.indexOf(";", offset);
// set index of end of cookie value
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(off set, end))
}
}
return returnvalue;
}

function loadornot(){
if (get_cookie('popunder')==''){
loadpopunder()
document.cookie="popunder=yes"
}
}

function loadpopunder(){
win2=window.open(popunder,"",winfeatures)
win2.blur()
window.focus()
}

if (once_per_session==0)
loadpopunder()
else
loadornot()

</script>

Firefox won't allow a popup/popunder unless it has been activated by a click. Nothing else you can do.

Some developers have been attaching click events to the BODY, when they want to advertise something. I find this annoying.

you can make it show insider window instead of popup

Yeah, I recommend doing an internal popup. Lightwindow is a good one.

Some developers have been attaching click events to the BODY, when they want to advertise something. I find this annoying

i like popup under in BODY, can you share for me?

window.onload = function() {
   document.body.onclick = loadornot;
}

Replacing your code-block

if (once_per_session==0)
loadpopunder()
else
loadornot()

<script>


var popunder="http://yahoo.com"

//specify popunder window features
//set 1 to enable a particular feature, 0 to disable
var winfeatures="width=800,height=510,scrollbars=1,res izable=1,toolbar=1,location=1,menubar=1,status=1,d irectories=0"

//Pop-under only once per browser session? (0=no, 1=yes)
//Specifying 0 will cause popunder to load every time page is loaded
var once_per_session=0

///No editing beyond here required/////

function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) { // if cookie exists
offset += search.length
// set index of beginning of value
end = document.cookie.indexOf(";", offset);
// set index of end of cookie value
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(off set, end))
}
}
return returnvalue;
}

function loadornot(){
if (get_cookie('popunder')==''){
loadpopunder()
document.cookie="popunder=yes"
}
}

function loadpopunder(){
win2=window.open(popunder,"",winfeatures)
win2.blur()
window.focus()
}

window.onload = function() {
document.body.onclick = loadornot;
}

</script>

i had change, but it's not ok

I misunderstood the code a bit.

Instead of:

window.onload = function() {
   document.body.onclick = loadornot;
}

Do:

window.onload = function() {
   document.body.onclick = function() {
      if (once_per_session==0)
         loadpopunder();
      else
         loadornot();
   }
}

sorry, I too stupid to do this