var  flag=false; 
function  DrawImage(ImgD,wid,hei){  
     var  image=new  Image();  
     image.src=ImgD.src;  
     if(image.width>0  &&  image.height>0){  
       flag=true;  
       if(image.width/image.height>=  wid/hei){  
         if(image.width>wid){      
         ImgD.width=wid;  
         ImgD.height=(image.height*wid)/image.width;  
         }else{  
         ImgD.width=image.width;      
         ImgD.height=image.height;  
         }  
         ImgD.alt=ImgD.alt;  
         }  
       else{  
         if(image.height>hei){      
         ImgD.height=hei;  
         ImgD.width=(image.width*hei)/image.height;
         }else{  
         ImgD.width=image.width;      
         ImgD.height=image.height;  
         }  
         ImgD.alt=ImgD.alt;  
         }  
       }  
}