  <!--   
  //图片按比例缩放   
  var flag=false;   
  function DrawImage(ImgD,x,y){   
  var image=new Image();   
  var iwidth   =   x;     //定义允许图片宽度   
  var iheight   =   y;     //定义允许图片高度   
  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;   
  }   
  }   
  }     
  //调用：<img   src="图片"   onload="javascript:DrawImage(this)">   
  //-->   