(function($){
   $.fn.sideadv = function(options){      
	   var defaults = {
		  oparent : this,	
		  btnname : 'closebtn',
		  posx    : 300,
		  posy    : 200,
		  timer   : 30,
		  stepx   : 1,	
		  stepy   : 1,
		  limitx  : false,
		  limity  : false		  
	   };	  
	   var opt = $.extend(defaults,options);
	   
	   var _self = opt.oparent;
	   _self.timer = null;
	   clearinterval(_self.timer);		  
	   _self.timer = setinterval(function(){
		  startmove(_self);
	   },opt.timer);
	   _self.hover(function(){
		   clearinterval(_self.timer);
	   },function(){
		   _self.timer = setinterval(function(){
			   startmove(_self);
		   },opt.timer);
	   });
	   $('.'+opt.btnname).click(function(){
		   $(this).parent().css('display','none');   
	   })  
	   
	   function startmove(_self){		     
		 var setw = $(window).width()-10;
		 var seth = $(window).height();
		 
		 var width = _self.height();
		 var height = _self.height();
		 
		 var setleft = $(document).scrollleft() + opt.posx;
		 var settop  = $(document).scrolltop() + opt.posy;
		 
		 _self.css('left',setleft);
		 _self.css('top',settop);
		 
		 if(opt.limitx){
			 opt.posx += opt.stepx; 
		 }else{
			 opt.posx -= opt.stepx;	 
		 }			 
		 if(opt.posx < 0){
			opt.posx = 0;
			opt.limitx = true;
		 }
		 if(opt.posx >= setw - width){
			 opt.posx = setw - width;
			 opt.limitx = false;
		 }
		 
		 if(opt.limity){
			 opt.posy += opt.stepy; 
		 }else{
			 opt.posy -= opt.stepy;	 
		 }			 
		 if(opt.posy < 0){
			opt.posy = 0;
			opt.limity = true;
		 }
		 if(opt.posy >= seth - height){
			 opt.posy = seth - height;
			 opt.limity = false;
		 }   
	  } 		   
   }  
})(jquery);