var difX = Math.abs((WORLD_WIDTH/2) - x);
    		var difY = Math.abs((WORLD_HEIGHT/2) - y);
 
			var distanceFromCenter = difX + difY;
 
			if (distanceFromCenter == 0)
			{
				world.firstLayer[x][y] = FirstLayerType.GRASS;
 
				break;
			}
 
			var chance = (100 - (distanceFromCenter/(WORLD_WIDTH + WORLD_HEIGHT)))*100;
 
			//alert ("fidtance from center: " + distanceFromCenter + "   chance:" + chance);
 
			if (chance > 100)
				chance = 100;
 
 
 
			if (100/chance >= Math.random()*100)
				world.firstLayer[x][y] = FirstLayerType.GRASS;
 
 

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