View difference between Paste ID: f0Y19dEt and ypkJy63W

 function Mandeliter( cx, cy, maxiter ){
   var
     x = 0.0,
     y = 0.0,
     xx = 0,
     yy = 0,
     xy = 0;
 
   var i = maxiter;
   while( i-- && xx + yy <= 4 ){
     xy = x * y;
     xx = x * x;
     yy = y * y;
     x = xx - yy + cx;
     y = xy + xy + cy;
   }
   return maxiter - i;
 }
 
 function Mandelbrot( width,height, xmin,xmax, ymin,ymax, iterations ){
   var canvas = document.createElement( 'canvas' );
   canvas.width = width;
   canvas.height = height;
 
   var ctx = canvas.getContext( '2d' );
   var img = ctx.getImageData( 0, 0, width, height );
   var pix = img.data;
   for( var ix = 0; ix < width; ++ix )
     for( var iy = 0; iy < height; ++iy )
     {
       var x = xmin + (xmax - xmin) * ix / (width - 1);
       var y = ymin + (ymax - ymin) * iy / (height - 1);
       var i = Mandeliter( x, y, iterations );
       var ppos = 4 * (width * iy + ix);
       if( i === iterations )
       {
         pix[ppos] = 0;
         pix[ppos+1] = 0;
         pix[ppos+2] = 0;
       }
       else
       {
         var c = 3 * Math.log(i)/Math.log(iterations - 1.0);
         if (c < 1)
         {
           pix[ppos] = 255*c;
           pix[ppos+1] = 0;
           pix[ppos+2] = 0;
         }
         else if( c < 2 )
         {
           pix[ppos] = 255;
           pix[ppos+1] = 255*(c-1);
           pix[ppos+2] = 0;
         }
         else
         {
           pix[ppos] = 255;
           pix[ppos+1] = 255;
           pix[ppos+2] = 255*(c-2);
         }
       }
       pix[ ppos+3 ] = 255;
     }
   ctx.putImageData( img, 20,20 );
 //  document.body.insertBefore( canvas, document.body.childNodes[0] );
   document.body.appendChild( canvas, document.body.childNodes[0] );
 }
 var mandel = confirm("Do you wish me to draw the Mandelbrot Set?");
 var p;
 if(mandel)
 {
 	p = prompt("How many iterations (100-5000)?",100);
 	Mandelbrot( 450,300, -2,1, -1,1, p );
 // print number of iterations
 	document.write("Iterations: ", p);
 }
 else{
 	document.write("Nothing to see - User declined!");
 	alert("User Declined the option \n of rendering the Mandelbrot Set");
 }