How can I make the slide-in box slide in more smoothly?

[qwikad.com]

If you go to this page: http://qwikad.com/index.php?view=pos...id=263&lang=en you will see that when the box slides in it doesn't really have much "grace" about it (please, note: it slides in once per browser session, so if you want to see it again, you will have to close and open the browser again).

Here's the js part of the code:

<script type="text/javascript">

/***********************************************
* Amazon style Drop-in content box- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* Visit DynamicDrive.com for hundreds of DHTML scripts
* This notice must stay intact for legal use
* Go to http://www.dynamicdrive.com/ for full source code
***********************************************/

var dropboxleft=200 //set left position of box (in px)
var dropboxtop=100 //set top position of box (in px)
var dropspeed=16 //set speed of drop animation (larger=faster)

//Specify display mode. 3 possible values are:
//1) "always"- This makes the fade-in box load each time the page is displayed
//2) "oncepersession"- This uses cookies to display the fade-in box only once per browser session
//3) integer (ie: 5)- Finally, you can specify an integer to display the box randomly via a frequency of 1/integer...
// For example, 2 would display the box about (1/2) 50% of the time the page loads.

var displaymode="oncepersession"

///Don't edit beyond here///////////

if (parseInt(displaymode)!=NaN)
var random_num=Math.floor(Math.random()*displaymode)
var ie=document.all
var dom=document.getElementById

function initboxv2(){
if (!dom&&!ie)
return
crossboxcover=(dom)?document.getElementById("box1") : document.all.box1
crossbox=(dom)?document.getElementById("box2"): document.all.box2
scroll_top=(ie)? truebody().scrollTop : window.pageYOffset
crossbox.height=crossbox.offsetHeight
crossboxcover.style.height=parseInt(crossbox.height)+"px"
crossbox.style.top=crossbox.height*(-1)+"px"
crossboxcover.style.left=dropboxleft+"px"
crossboxcover.style.top=dropboxtop+"px"
crossboxcover.style.visibility=(dom||ie)? "visible" : "show"
dropstart=setInterval("dropinv2()",50)
}

function dropinv2(){
scroll_top=(ie)? truebody().scrollTop : window.pageYOffset
if (parseInt(crossbox.style.top)<0){
crossboxcover.style.top=scroll_top+dropboxtop+"px"
crossbox.style.top=parseInt(crossbox.style.top)+dropspeed+"px"
}
else{
clearInterval(dropstart)
crossbox.style.top=0
}
}

function okgotit(){
if (window.dropstart) clearInterval(dropstart)
crossboxcover.style.visibility="hidden"
}

function truebody(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function get_cookie(Name) {
var search = Name + "="
var returnvalue = ""
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) {
offset += search.length
end = document.cookie.indexOf(";", offset)
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}

if (displaymode=="oncepersession" && get_cookie("droppedinv2")=="" || displaymode=="always" || parseInt(displaymode)!=NaN && random_num==0){
if (window.addEventListener)
window.addEventListener("load", initboxv2, false)
else if (window.attachEvent)
window.attachEvent("onload", initboxv2)
else if (document.getElementById || document.all)
window.onload=initboxv2
if (displaymode=="oncepersession")
document.cookie="droppedinv2=yes"
}

</script>

Is there a generic function that can be added to the code to make the box slide in more smoothly?

[ajfmrf]

what do you mean "more smoothly"?

faster,or do you want to change the appearance?

[qwikad.com]

what do you mean "more smoothly"?

faster,or do you want to change the appearance?

I want it to slide in without jerking. It's not quite smooth as of now. It has something to do with animation. But what code can accomplish that?

[ajfmrf]

Other then changing the speed of the dropin from 15 to 5(lower then 15) I could not change things from as what you got now. I tried the integer -put 2 in instead of the oncepersession like you have it ,but I was not able to a difference

[vwphillips]

the animation is much smoother when set to always so try a timout on the first load

/***********************************************
* Amazon style Drop-in content box- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* Visit DynamicDrive.com for hundreds of DHTML scripts
* This notice must stay intact for legal use
* Go to http://www.dynamicdrive.com/ for full source code
***********************************************/

var dropboxleft=200 //set left position of box (in px)
var dropboxtop=100 //set top position of box (in px)
var dropspeed=16 //set speed of drop animation (larger=faster)

//Specify display mode. 3 possible values are:
//1) "always"- This makes the fade-in box load each time the page is displayed
//2) "oncepersession"- This uses cookies to display the fade-in box only once per browser session
//3) integer (ie: 5)- Finally, you can specify an integer to display the box randomly via a frequency of 1/integer...
// For example, 2 would display the box about (1/2) 50% of the time the page loads.

var displaymode="always"

///Don't edit beyond here///////////

if (parseInt(displaymode)!=NaN)
var random_num=Math.floor(Math.random()*displaymode)
var ie=document.all
var dom=document.getElementById

function initboxv2(){
if (!dom&&!ie)
return
crossboxcover=(dom)?document.getElementById("box1") : document.all.box1
crossbox=(dom)?document.getElementById("box2"): document.all.box2
scroll_top=(ie)? truebody().scrollTop : window.pageYOffset
crossbox.height=crossbox.offsetHeight
crossboxcover.style.height=parseInt(crossbox.height)+"px"
crossbox.style.top=crossbox.height*(-1)+"px"
crossboxcover.style.left=dropboxleft+"px"
crossboxcover.style.top=dropboxtop+"px"
crossboxcover.style.visibility=(dom||ie)? "visible" : "show"
dropstart=setInterval("dropinv2()",50)
}

function dropinv2(){
scroll_top=(ie)? truebody().scrollTop : window.pageYOffset
if (parseInt(crossbox.style.top)<0){
crossboxcover.style.top=scroll_top+dropboxtop+"px"
crossbox.style.top=parseInt(crossbox.style.top)+dropspeed+"px"
}
else{
clearInterval(dropstart)
crossbox.style.top=0
}
}

function okgotit(){
if (window.dropstart) clearInterval(dropstart)
crossboxcover.style.visibility="hidden"
}

function truebody(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function get_cookie(Name) {
var search = Name + "="
var returnvalue = ""
if (document.cookie.length > 0) {
 offset = document.cookie.indexOf(search)
 if (offset != -1) {
  offset += search.length
  end = document.cookie.indexOf(";", offset)
  if (end == -1)
   end = document.cookie.length;
  returnvalue=unescape(document.cookie.substring(offset, end))
 }
}
return returnvalue;
}

if (displaymode=="oncepersession" && get_cookie("droppedinv2")=="" || displaymode=="always" || parseInt(displaymode)!=NaN && random_num==0){
 if (window.addEventListener)
  window.addEventListener("load", Display, false)
 else if (window.attachEvent)
  window.attachEvent("onload", Display)
 else if (document.getElementById || document.all)
  window.onload=Display
}

function Display(){
setTimeout(function(){ if (displaymode=="oncepersession"){ document.cookie="droppedinv2=yes";  } initboxv2(); },2000);
}

[qwikad.com]

No can do, vwphillips, simply because I need it to show it just once per session. Is ANYTHING I can do to add to the animation to make it more smooth at the current speed and load per session???