Javascript Fish Class

Class.Fish.js

// JavaScript Document

function Fish(na, im, w, h, sw, sh, sf) {

	/* Private Var Declarations */
	var name = na;
	var image = im;
	var height = h;
	var width = w;
	var start_height = sh;
	var start_width = sw;
	var start_flipped = sf;
	var going_right = true;
	var going_down = true;
	var object = null;
	
	/* Public Var Declarations */
	this.container = $('#fish_cont');
	this.change = 6000;
	this.speed = 50;
	this.ymax = window.innerHeight;
	this.xmax = window.innerWidth;
	
	/* Private Method Declarations */
	var move_to = function move_to(obj, x, y) {
		if (obj==null) {
			obj = object;
		}
		obj.css('left', x + 'px');
		obj.css('top', y + 'px');
	}
	
	var move_by = function move_by(obj, x, y) {
		if (obj==null) {
			obj = object;
		}
		obj.css('left', (parseInt(obj.css('left')) + x) + 'px');
		obj.css('top', (parseInt(obj.css('top')) + y) + 'px');
	}
	
	var checkdir = function checkdir(obj) {
		if ( going_right ) {
			obj.addClass('flip');
		} else {
			obj.removeClass('flip');
		}
	}
	
	/* Public Method Declarations */
	this.create = create;
	this.bobble = bobble;
	this.destroy = destroy;
	this.obj = get_object;
	
	/* Methods */
	function create() {
		this.container.append('<img id="f_'+name+'" src="'+image+'" class="fish '+ (start_flipped?'flip':'') +'" style="height:'+height+';width:'+width+';top:'+start_height+';left:'+start_width+';">');
		object = $('#f_'+name);
	}
	
	function bobble() {
		incrx = 0;
		incry = 0;
		incrx=Math.floor(Math.random() * (this.xmax - parseInt(width)));
		incry=Math.floor(Math.random() * (this.ymax - parseInt(height)));
		console.log(incrx);
		console.log(incry);
		going_right = (incrx <= parseInt(object.css('left')))?false:true;
		checkdir(object);
		object.animate({
			left: incrx + 'px',
			top: incry + 'px'
		}, 1000, function() {
			bobble();
		});
	}
	
	function destroy() {
	
	}
	
	function get_object() {
		return object;
	}
}