var flag=false;
function setImg(ImgD,iwidth,iheight){
	var image=new Image();
	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;
		}
	}
}

/*  function  setImg(img,width,height)   
  {   
      var   s1   =   width / height;   
      var   s2   =   img.offsetWidth / img.offsetHeight;   
      if(s1 > s2)   
		img.height = img.offsetHeight>height ? height : img.offsetHeight;   
      else     
		img.width  = img.offsetWidth>width ? width : img.offsetWidth;   
  }   
*/