https://radioing.com/moveobj.js

1/***********************************************
2* Floating image script- By Virtual_Max (http://www.geocities.com/siliconvalley/lakes/8620)
3* Modified by Dynamic Drive for various improvements
4* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
5***********************************************/
6
7
8var vmin=2;
9var vmax=5;
10var vr=2;
11var timer1;
12
13function iecompattest(){
14return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
15}
16
17function Chip(chipname,width,height){
18 this.named=chipname;
19 this.vx=vmin+vmax*Math.random();
20 this.vy=vmin+vmax*Math.random();
21 this.w=width+20;
22 this.h=height;
23 this.xx=0;
24 this.yy=0;
25 this.timer1=null;
26}
27
28function movechip(chipname){
29if (document.getElementById){
30eval("chip="+chipname);
31   if (window.innerWidth || window.opera){
32		 pageX=window.pageXOffset;
33     pageW=window.innerWidth-40;
34     pageY=window.pageYOffset;
35     pageH=window.innerHeight-20;
36    }
37   else if (document.body){
38		 pageX=iecompattest().scrollLeft;
39     pageW=iecompattest().offsetWidth-40;
40     pageY=iecompattest().scrollTop;
41     pageH=iecompattest().offsetHeight-20;
42    } 
43
44   chip.xx=chip.xx+chip.vx;
45   chip.yy=chip.yy+chip.vy;
46   
47   chip.vx+=vr*(Math.random()-0.5);
48   chip.vy+=vr*(Math.random()-0.5);
49   if(chip.vx>(vmax+vmin))  chip.vx=(vmax+vmin)*2-chip.vx;
50   if(chip.vx<(-vmax-vmin)) chip.vx=(-vmax-vmin)*2-chip.vx;
51   if(chip.vy>(vmax+vmin))  chip.vy=(vmax+vmin)*2-chip.vy;
52   if(chip.vy<(-vmax-vmin)) chip.vy=(-vmax-vmin)*2-chip.vy;
53
54   if(chip.xx<=pageX){
55			chip.xx=pageX;
56      chip.vx=vmin+vmax*Math.random();
57     }
58   if(chip.xx>=pageX+pageW-chip.w){
59			chip.xx=pageX+pageW-chip.w;
60      chip.vx=-vmin-vmax*Math.random();
61     }
62   if(chip.yy<=pageY)
63     {chip.yy=pageY;
64      chip.vy=vmin+vmax*Math.random();
65     }
66   if(chip.yy>=pageY+pageH-chip.h)
67     {chip.yy=pageY+pageH-chip.h;
68      chip.vy=-vmin-vmax*Math.random();
69     }
70
71document.getElementById(chip.named).style.left=chip.xx+"px";
72document.getElementById(chip.named).style.top=chip.yy+"px";
73
74
75   chip.timer1=setTimeout("movechip('"+chip.named+"')",100);
76  }
77}