$(function() {
       $('#gallery a').lightBox();
 });

function showbigimage(){
	var indexvalue=$("#a_big_img").attr("name");
	
	var id = '#gallery_sub_a'+indexvalue;
	$(id).click();
}

 function show_image(obj)
 {

	var s_img=obj.src;
	
	var b_src=$("#"+obj).attr("alt");
	var num=$("#"+obj).attr("name");
	

	$('#gallery img').attr("class",'pic01');
	$("#"+obj).addClass('pic02');
		
	
	$("#a_big_img").attr("name",num);



	$("#big_img").attr("src",b_src);

 }

function DrawImg(boxWidth,boxHeight)
{
    var imgWidth=$("#big_img").width();
    var imgHeight=$("#big_img").height();
    //比较imgBox的长宽比与img的长宽比大小
    if((boxWidth/boxHeight)>=(imgWidth/imgHeight))
    {
        //重新设置img的width和height
        $("#big_img").width((boxHeight*imgWidth)/imgHeight);
        $("#big_img").height(boxHeight);
        //让图片居中显示
        var margin=(boxWidth-$("#big_img").width())/2;
        $("#big_img").css("margin-left",margin);
    }
    else
    {
        //重新设置img的width和height
        $("#big_img").width(boxWidth);
        $("#big_img").height((boxWidth*imgHeight)/imgWidth);
        //让图片居中显示
        var margin=(boxHeight-$("#big_img").height())/2;
        $("#big_img").css("margin-top",margin);
    }
}