function showsort(s){



	s.style.backgroundColor="#ff926b";



	var obj=s.getElementsByTagName("ul")[0];



	if(!obj) return false;



	obj.style.display="block";



}



function hidesort(s){



	s.style.backgroundColor="";



	var obj=s.getElementsByTagName("ul");



	for (var i=0; i<obj.length; i++){



		obj[i].style.display="none";



	}



}



function inititem(s){



	var obj=s.getElementsByTagName("li");



	if(!obj) return false;



	for (var i=0; i<obj.length; i++){



		obj[i].onmouseover=function(){showsort(this);}



		obj[i].onmouseout=function(){hidesort(this);}



	}



}



function init(){



	var els = document.getElementById("menu").getElementsByTagName("li");



	for (var i=0; i<els.length; i++){



		inititem(els[i]);



	}



}











/**



* 图片大小缩放



* 用法:



* $("img.resize").resize({"imgWidth":150,"imgHeight":150});



* 样式名称,图片宽高



* center是否居中



*/



$.fn.resize=function(settings){



	var default_setting={



		imgWidth:160,



		imgHeight:120,



		center:false



	};



	settings = $.extend({},default_setting,settings);







	return this.each(function(i,n){



		var boxWidth=settings.imgWidth;



		var boxHeight=settings.imgHeight;



		var img=new Image();



		var imgWidth,imgHeight;



		img.src=this.src;



		imgWidth=img.width;



		imgHeight=img.height;



		if((boxWidth/boxHeight)>=(imgWidth/imgHeight)){



			//重新设置img的width和height



			$(this).width((boxHeight*imgWidth)/imgHeight);



			$(this).height(boxHeight);



			//让图片居中显示



			if(true===settings.center){



				var margin=(boxWidth-$(this).width())/2;



				$(this).css("margin-left",margin);



			}



		}else{



			//重新设置img的width和height



			$(this).width(boxWidth);



			$(this).height((boxWidth*imgHeight)/imgWidth);



			//让图片居中显示



			if(true===settings.center){



				var margin=(boxHeight-$(this).height())/2;



				$(this).css("margin-top",margin);



			}



		}



		if(true===settings.center){



			$(this).css({"display":"table-cell","vertical-align":"middle"});



		}



	});







};



 







$(function(){



 



	/*图片缩放*/



	$(".pro_img img").resize({"imgWidth":170,"imgHeight":180});



 



});