JS Funktionen -> Auswirkung?

[tysk]

Hallo,

bzgl. folgender Funktionen würde ich gerne wissen, was diese genau bewirken - bin neu im Bereich JS (eine kurze Erläuterung reicht schon aus, wer jedoch mehr erklären möchte...IMMER GERNE! ;-)

<script
       language="JavaScript"
       type="text/javascript">
<!-- Begin
function NewWindow(mypage, myname, w, h, scroll) {
var winl = ((screen.width - w) / 2);
var wint = ((screen.height - h) / 2);
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}
// End -->
</script>
<script
       language="JavaScript"
       type="text/javascript">
<!--
function preloadImages() {
var d=document; if(d.images){ if(!d.p) d.p=new Array();
var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}
//-->
</script>
<script
       language="JavaScript"
       type="text/javascript">
<!--
function swapImgRestore() {
var i,x,a=document.sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function findObj(n, d) {
var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document); return x;
}
function swapImage() {
var i,j=0,x,a=swapImage.arguments; document.sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=findObj(a[i]))!=null){document.sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</script>

Thx!
tysk