Weird!

javascript:
//assigns a value to R
R=0;
//assigns a value to x1
x1=.1;
//assigns a value to y1
y1=.05;
//assigns a value to x2
x2=.25;
//assigns a value to y2
y2=.24;
//assigns a value to x3
x3=1.6;
//assigns a value to y3
y3=.24;
//assigns a value to x4
x4=300;
//assigns a value to y4
y4=200;
//assigns a value to x5
x5=300;
//assigns a value to y5
y5=200;
//gets the info for each HTML <img> element
DI=document.getElementsByTagName("img");
//gets the number of img elements
DIL=DI.length;
//starts a function called A
function A() {
  //a for loop that runs from zero to i-DIL incrementing by 1 each time it loops
  for(i=0; i-DIL; i++){
    //assigns the style of the current img element to DIS
    DIS=DI[ i ].style;
    //makes the position style of the element absolute (fixed on the page)
    DIS.position='absolute';
    //assigns a left coordinate (distance from left in pixels) for the current img element
    DIS.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+ "px";
    //assigns a top coordinate (distance from top in pixels) for the current img element
    DIS.top=(Math.cos(R*y1+i*y2+y3)*y4+y5)+" px"
    //increments R by 1
    }R++
  }
//calls the above function every 5 milliseconds
setInterval('A()',5);
//returns null to prevent a new page opening
void(0);