create:function (){
        //var picIndex= this.game.rnd.integerInRange(1, 100);
        //var key= 'backgroundLvl2'+picIndex;

        this.clickLock=false;
        this.blockGroup= this.game.add.group();
        var count=0;

for (var row=0;row<4;row++)
    {
        for (var col=0;col<4;col++)
        {
            var block=this.game.add.sprite(col*160,row*160,'backgroundLvl2');
            block.ox=block.x;
            block.oy=block.y;
            block.inputEnabled= true;
            block.events.onInputDown.add(this.pickBlock,this);
            block.frame = count;
            count++;
            this.blockGroup.add(block);
        }
    }

    this.blockGroup.x=this.game.width/2-this.blockGroup.width/2;
    this.blockGroup.y=this.game.height/2-this.blockGroup.height/2;

    this.endBlock=block;

    this.endBlock.loadTexture("SqB")
        this.scramblePics();
    },


    pickBlock:function (block)
    {
        if(this.clickLock == true)
        {
            return;

        }
        if(this.endBlock==block)
        {
            return;
        }


        var diffX = Math.abs(this.endBlock.x - block.x);
        var diffY = Math.abs(this.endBlock.y-block.y);

        if( diffX>160 || diffY>160){
            return;
        }

        if (diffY == 160 && diffX==160 ){
            return;
        }

        block.bringToTop();

        this.clickLock=true;
        var x1= block.x;
        var y1= block.y;
       // block.x= this.endBlock.x;
       // block.y= this.endBlock.y;
        //this.endBlock.y=y1;
        //this.endBlock.x=x1;
        this.moveBlock(block,this.endBlock.x,this.endBlock.y);
        this.moveBlock(this.endBlock,x1,y1);

    },

scramblePics:function(){
        for(var i=0;i<100;i++) {
            var block1 = this.game.rnd.integerInRange(0, this.blockGroup.children.length - 1);
            var block2 = this.game.rnd.integerInRange(0, this.blockGroup.children.length -1 );

            block1 = this.blockGroup.getChildAt(block1Index);
            block2 = this.blockGroup.getChildAt(block2Index);
            this.swapBlocks(block1, block2);
        }
    },

swapBlocks(block1,block2){
        var tempX = block1.x;
        var tempY =block1.y;

        block1.x=block2.x;
        block1.y=block2.y;

        block2.x=tempX;
        block2.y=tempY;
    },

    moveBlock(block,xx,yy){

        var tw= this.game.add.tween(block).to({y:yy, x:xx},500, Phaser.Easing.Linear.None, true);
        tw.onComplete.add(this.tweenDone,this)
    },

    tweenDone:function () {
        this.checkWin();
        this.clickLock=false;
    },

    checkWin(){
        var win= true;

        this.blockGroup.forEach(function (block) {
            if (block.x!=block.ox||block.y!=block.oy){
                win=false;
            }
        }.bind(this));

    },