/**

• @param {Integer|String} c If set to 0 or a string replace the current block

• with c in the playing field array, otherwise check for collision
  

• @return {Integer} returns 1 if a collision is detected and 'undefined' otherwise */

String.prototype.trim = function(e) { if(e === true){
return this.replace(/\s/g,''); } else { return this.replace(/(^\s*)|(\s*$)/g,''); } }

var html = '