multiple color gredient background

/*color gredient*/
var colors = new Array(
  [208,38,164],
  [107,62,219],
  [62,191,254],
  [208,38,164],
  [107,62,219],
  [62,191,254]);

var step = 0;
//color table indices for:
// current color left
// next color left
// current color right
// next color right
var colorIndices = [0,1,2,3];

//transition speed
var gradientSpeed = 0.001;

function updateGradient()
{
 
  if ( $===undefined ) return;
 
var c0_0 = colors[colorIndices[0]];
var c0_1 = colors[colorIndices[1]];
var c1_0 = colors[colorIndices[2]];
var c1_1 = colors[colorIndices[3]];

var istep = 1 - step;
var r1 = Math.round(istep * c0_0[0] + step * c0_1[0]);
var g1 = Math.round(istep * c0_0[1] + step * c0_1[1]);
var b1 = Math.round(istep * c0_0[2] + step * c0_1[2]);
var color1 = "rgb("+r1+","+g1+","+b1+")";

var r2 = Math.round(istep * c1_0[0] + step * c1_1[0]);
var g2 = Math.round(istep * c1_0[1] + step * c1_1[1]);
var b2 = Math.round(istep * c1_0[2] + step * c1_1[2]);
var color2 = "rgb("+r2+","+g2+","+b2+")";

 $('#gradient').css({background: "-webkit-gradient(58deg, "+color1+" 0%, "+color2+" 100%)"})
              .css({background: "-moz-linear-gradient(58deg, "+color1+" 0%, "+color2+" 100%)"})
              .css({background: "linear-gradient(58deg, "+color1+" 0%, "+color2+" 100%)"});

$('#gr').css({background: "-webkit-gradient(58deg, "+color1+" 0%, "+color2+" 100%)"})
              .css({background: "-moz-linear-gradient(58deg, "+color1+" 0%, "+color2+" 100%)"})
              .css({background: "linear-gradient(58deg, "+color1+" 0%, "+color2+" 100%)"});

  step += gradientSpeed;
  if ( step >= 1 )
  {
    step %= 1;
    colorIndices[0] = colorIndices[1];
    colorIndices[2] = colorIndices[3];
   
    //pick two new target color indices
    //do not pick the same as the current one
    colorIndices[1] = ( colorIndices[1] + Math.floor( 1 + Math.random() * (colors.length - 1))) % colors.length;
    colorIndices[3] = ( colorIndices[3] + Math.floor( 1 + Math.random() * (colors.length - 1))) % colors.length;
   
  }
}

setInterval(updateGradient,10);

Give id to div which you want to give color background