function DrawImage(ImgD,twidth,theight){
var flag=false;
var image=new Image();
var iwidth = twidth;  //定義允許圖片寬度
var iheight = theight;  //定義允許圖片高度
image.src=ImgD.src;
if(image.width>0 && image.height>0){
flag=true;
if(image.width/image.height>= iwidth/iheight){
  if(image.width>iwidth){   
  ImgD.width=iwidth;
  ImgD.height=(image.height*iwidth)/image.width;
  }else{
  ImgD.width=image.width;   
  ImgD.height=image.height;
  }
  ImgD.alt=image.width+"×"+image.height;
  }
else{
  if(image.height>iheight){   
  ImgD.height=iheight;
  ImgD.width=(image.width*iheight)/image.height;   
  }else{
  ImgD.width=image.width;   
  ImgD.height=image.height;
  }
  ImgD.alt=image.width+"×"+image.height;
  }
}
}  

<img src="="<%=rs("img")%>" onload="DrawImage(this,60,30)">