function jump(){
			var u = pagejump.options[pagejump.options.selectedIndex].value - 1;
			var Url= "javascript:changeUrl("+u+")";
			window.location.href = Url;
		}

		var Urls = document.location.href;
		var Urls_qian = Urls.substring(0,Urls.indexOf("/?")+1);

		function changeUrl(obj){
			var newUrl;
			if(obj==1){
				newUrl = Urls_qian ;
			}else{
				newUrl = Urls_qian +"?page="+obj;
			}
			document.location.href = newUrl;
		}
	//限高宽
	function changeImg(mypic){ 
			var xw=550; 
			var xl=550; 
					 
			var width = mypic.width; 
			var height = mypic.height; 
			var bili = width/height;         
					 
			var A=width/xw; 
			var B=height/xl; 
					 
			if(A>1||B>1) 
			{ 
					if(A>B) 
					{ 
							mypic.width=xw; 
							mypic.height=xw/bili; 
					} 
					if(A<B) 
					{ 
							mypic.width=xl*bili; 
							mypic.height=xl; 
					} 
			}
			
	}