function  AutosizeImage(ImgD,maxwidth,maxheight){  
     var image=new Image();
	 image.src=ImgD.src;
     if(image.width>0  &&  image.height>0){  
       flag=true;  
       if(image.width/image.height >= maxwidth/maxheight){  
         if(image.width > maxwidth){      
         ImgD.width=maxwidth;  
         ImgD.height=(image.height*maxwidth)/image.width;  
         }else{  
         ImgD.width=image.width;      
         ImgD.height=image.height;  
         }
         }  
       else{  
         if(image.height>maxheight){      
         ImgD.height=maxheight;  
         ImgD.width=(image.width*maxheight)/image.height;            
         }else{  
         ImgD.width=image.width;      
         ImgD.height=image.height;  
         }  
         }  
       }  
}