var  flag=false;  
function  drawimage(imgd,width,height){  
     var  image=new  image();  
     image.src=imgd.src;  
     if(image.width>0  &&  image.height>0){  
       flag=true;  
       if(image.width/image.height>=  width/height){  
         if(image.width>width){      
         imgd.width=width;  
         imgd.height=(image.height*width)/image.width;  
         }else{  
         imgd.width=image.width;      
         imgd.height=image.height;  
         }  
      //   imgd.alt=image.width+"×"+image.height;  
         }  
       else{  
         if(image.height>height){      
         imgd.height=height;  
         imgd.width=(image.width*height)/image.height;            
         }else{  
         imgd.width=image.width;
         imgd.height=image.height;  
         }  
     //    imgd.alt=image.width+"×"+image.height;  
         }  
       }  
}
//onload="javascript:drawimage(this,width,height);"