var flag=false;
function DrawImage(ImgD,ImgW,ImgH,content){
var image=new Image();
var FitWidth=ImgW;                        //图片要显示的宽
var FitHeight=ImgH;                        //图片要显示的高
image.src=ImgD.src;
if(image.width>0 && image.height>0){
flag=true;
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;
}
	if(content==''){
	   ImgD.alt="原图片大小("+image.width+"×"+image.height+")";
	} else {
	   ImgD.alt=content;
	}
}
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(content==''){
	ImgD.alt="原图片大小("+image.width+"×"+image.height+")";
 } else {
	   ImgD.alt=content;
	}
}
}
}