hvad gør javascript??

Hej jeg fandt denne kode til nået af en 3dchat, men hvad gør den?

<Script Language="JavaScript">
<? if (!$framecheck) {
print "parent.midtframe.cols='420,*,0'";
} ?>

function go2(fil) {
parent.info.location=fil;
}


function move(x,y) {

parent.bot.document.location.replace("bot.php?x="+x+"&y="+y+"&move=ok");


mydiv = document.getElementById('loading2').style;

mydiv.visibility = "visible";


var sjover=document.images["felt-"+x+"-"+y].src


if( document.images["felt-"+x+"-"+y].src.indexOf("spacer.gif")>=0 ) {
// if (document.images["felt-"+x+"-"+y].src == "../gfx/spacer.gif") {

mydiv = userdiv.style;

mydiv.left = x-0;

mydiv.top = y-0;



mydiv = usernamediv.style;

mydiv.left = x-0;

mydiv.top = y+60;

}

}



if (window.Event)

  document.captureEvents(Event.MOUSEUP);



function nocontextmenu()

{

event.cancelBubble = true

event.returnValue = false;



return false;

}



function norightclick(e)

{

if (window.Event)

{

  if (e.which == 2 || e.which == 3)

  return false;

}

else

  if (event.button == 2 || event.button == 3)

  {

  event.cancelBubble = true

  event.returnValue = false;

  return false;

  }



}



document.oncontextmenu = nocontextmenu;

document.onmousedown = norightclick;

</Script>