ie6下的max-width;max-height;min-width;min-height;处理

 

img {    
    max-width:200px;
    max-height:132px;  
    min-width:100px;
    min-height:100px; 
    cursor:pointer;    
    border:1px dashed #4E6973;    
    padding: 3px;    
    zoom:expression( function(elm) { 
         if(elm.width>0 && elm.height>0)
         {
            var max_width = 200;
            var max_height = 132;
            var min_width = 100;
            var min_height = 100;
            //min
            if(elm.width/elm.height<=min_width/min_height)
            {
               if(elm.width<min_width)
               {
                  elm.width=min_width;
                  elm.height=(elm.height/min_width)*elm.width;
               }
            }
            else
            {
               if(elm.height<min_height)
               {
                  elm.height=min_height;
                  elm.width=(elm.width/min_height)*elm.height;
               }
            }
            //max
            if(elm.width/elm.height>=max_width/max_height)
            {
               if(elm.width>max_width)
               {
                  elm.width=max_width;
                  elm.height=(elm.height*max_width)/elm.width;
               }
            }
            else
            {
               if(elm.height>max_height)
               {
                  elm.height=max_height;
                  elm.width=(elm.width*max_height)/elm.height;
               }
            }
            elm.style.zoom = '1'; 
         }  
     }(this));    
}