function AutoResizeImage(maxWidth,maxHeight,objImg){  
     if (typeof(objImg)=='string'){  
        objImg = $(objImg);  
     }  
     var img = new Image();  
     img.onload = function(){  
         var hRatio;  
         var wRatio;  
         var Ratio = 1;  
         var w = img.width;  
         var h = img.height;  
         wRatio = maxWidth / w;  
         hRatio = maxHeight / h;  
         wRatiowRatio = wRatio>1?1:wRatio;  
         hRatiohRatio = hRatio>1?1:hRatio;  
         if (maxWidth ==0 && maxHeight==0){  
            Ratio = 1;  
         }else if (maxWidth==0){//  
            if (hRatio<1) Ratio = hRatio;
        } else if (maxHeight == 0)
         {  
         if (wRatio<1) Ratio = wRatio;
        }
         else {  
             Ratio = (wRatio<=hRatio?wRatio:hRatio);  
         }  
         if (Ratio<1){  
            ww = w * Ratio;  
             hh = h * Ratio;  
         }  
         objImg.height = h;  
         objImg.width = w;  
         this.onload = function(){}  
     }  
     img.src = objImg.src;  
 }