jquery图片拖拽查看jquery图片自适应屏幕大小特效

$(document).ready(function(){
	$(".down_showpic").css("width",$(window).width());
	$(window).resize(function(){
		$(".down_showpic").css("width",$(window).width());
		$(".pictio").width($("#picbbox").width()).height($("#picbbox").height());
	});
});

var p_w;
var p_h;
$(".down_showpic>img").load(function(){
	p_w=$(this).width();
	p_h=$(this).height();
	$(".pictio").width($("#picbbox").width()).height($("#picbbox").height()).css({top:$(this).position().top,left:0}).fadeTo(100, 0.05);
})
dragpic=-1;
dragpicy=-1;
$(".pictio").bind({
	mousedown: function(e){
		//e=event?event:window.event;
		dragpic=e.pageX || (e.clientX);
		dragpicy=e.pageY || (e.clientY);
		if (e.stopPropagation){ 
			// this code is for Mozilla and Opera 
			e.stopPropagation(); 
			e.preventDefault();
		};
	},
	mouseup: function(){
		dragpic=-1;
	},mousemove: function(e){
		if(dragpic>=0){
			//e=event?event:window.event;
			dqsb=e.pageX || (e.clientX );
			dqsby=e.pageY || (e.clientY );
			$(".down_showpic").scrollLeft($(".down_showpic").scrollLeft()+(dragpic-dqsb))
			$(document).scrollTop($(document).scrollTop()+(dragpicy-dqsby))
			dragpic=dqsb
			dragpicy=dqsby
		}
	},mouseout: function(){
		dragpic=-1;
	}
});

$(".arc_push1").click(function(){
	$(".pictio").width($("#picbbox").width()).height($("#picbbox").height());
	$(".down_showpic>img").css({"width":"auto","height":"auto"});
	$(document).scrollTop($(".down_showpic").position().top);
	return false;
});

$(".arc_push2").click(function(){
	w=p_w;
	h=p_h;
	boxw=$(window).width()
	boxh=$(window).height()
	$(".pictio").width(boxw).height(boxh-$(".downbom").height());
	if(w(boxw/boxh)){
			$(".down_showpic>img").css({"width":boxw,height:"auto"});
		}else{
			//$(".down_showpic>img").css("width",boxw);
			$(".down_showpic>img").css({"width":"auto","height":boxh-$(".downbom").height()});
			
		}
	}
	$(document).scrollTop($(".down_showpic").position().top);
	return false;
});

$(".arc_push5").click(function(){
	w=p_w;
	h=p_h;
	boxw=$(window).width()
	boxh=$(window).height()
	$(".pictio").width($("#picbbox").width()).height($("#picbbox").height());
	if(wimg").css({"width":boxw,height:"auto"});
	}
	$(document).scrollTop($(".down_showpic").position().top);
	return false;
});