https://siej.org/js/base.js

1function MM_swapImgRestore() { //v3.0
2  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
3}
4
5function MM_preloadImages() { //v3.0
6  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
7    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
8    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
9}
10
11function MM_findObj(n, d) { //v4.01
12  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
13    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
14  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
15  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
16  if(!x && d.getElementById) x=d.getElementById(n); return x;
17}
18
19function MM_swapImage() { //v3.0
20  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
21   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
22}
23