function drawimage(imgd,fitwidth,fitheight){
	var image=new image();
	image.src=imgd.src;
	var fwidth = fitwidth;
	var fheight = fitheight;
	if(image.width>0 && image.height>0){
		/*if((image.height * 1.8) < image.width){
			fitheight = fitheight * 2.3 * (image.height / image.width);
			if(fitheight > fheight){
				fitheight = fheight;
			}
		}
		if((image.width * 1.8) < image.height){
			fitwidth = fitwidth * 2.3 * (image.width / image.height);
			if(fitwidth  > fwidth){
				fitwidth = fwidth;
			}
		}*/
		if(image.width/image.height <= fitwidth/fitheight){
			if(image.width>fitwidth){
				imgd.width=fitwidth;
				imgd.height=(image.height*fitwidth)/image.width;
			}else{
				imgd.width=image.width;
				imgd.height=image.height;
			}
		} else{
			if(image.height>fitheight){
				imgd.height=fitheight;
				imgd.width=(image.width*fitheight)/image.height;
			}else{
				imgd.width=image.width;
				imgd.height=image.height;
			}
		}
		if($(imgd).width() != fwidth){
			$left = - ($(imgd).width() - fitwidth) / 2;
			$left = $left + 'px';
			imgd.style.marginleft = $left;
		}
		if($(imgd).height() != fheight){
			$height = - ( $(imgd).height() - fitheight) / 2;
			$height = $height + 'px';
			imgd.style.margintop = $height;
		}
	}
}
function drawimage2(imgd,fitwidth,fitheight){
	var image=new image();
	image.src=imgd.src;
	if(image.width>0 && image.height>0){
		if(image.width/image.height>= fitwidth/fitheight){
			if(image.width>fitwidth){
				imgd.width=fitwidth;
				imgd.height=(image.height*fitwidth)/image.width;
			}else{
				imgd.width=image.width;
				imgd.height=image.height;
			}
		} else{
			if(image.height>fitheight){
				imgd.height=fitheight;
				imgd.width=(image.width*fitheight)/image.height;
			}else{
				imgd.width=image.width;
				imgd.height=image.height;
			}
		}
	}
}

//预先载入图片
function preloadimages(arr){
    var newimages=[]
    var arr=(typeof arr!="object")? [arr] : arr  //确保参数总是数组
    for (var i=0; i<arr.length; i++){
        newimages[i]=new image()
        newimages[i].src=arr[i]
    }
}

function addfavorite(surl, stitle) {
 
            surl = encodeuri(surl);
        try{  
 
            window.external.addfavorite(surl, stitle);  
 
        }catch(e) {  
 
            try{  
 
                window.sidebar.addpanel(stitle, surl, "");  
 
            }catch (e) {  
 
                alert("加入收藏失败，请使用ctrl+d进行添加,或手动在浏览器里进行设置.");
 
            }  
 
        }
 
}

function sethome(url){
 
        if (document.all) {
 
            document.body.style.behavior='url(#default#homepage)';
 
               document.body.sethomepage(url);
 
        }else{
 
            alert("您好,您的浏览器不支持自动设置页面为首页功能,请您手动在浏览器里设置该页面为首页!");
 
        }
 

}