function Wa_SetImgAutoSize(obj, MaxW, MaxH) 
{ 
 var imageObject = obj;

    var oldImage = new Image();
    oldImage.src = imageObject.src;
    var dW = oldImage.width; 
    var dH = oldImage.height;
    if(dW>MaxW || dH>MaxH) 
 {
        a = dW/MaxW; b = dH/MaxH;
        if( b>a ) a = b;
        dW = dW/a; dH = dH/a;
    }
    if(dW > 0 && dH > 0) 
 {
        imageObject.width = dW;
  imageObject.height = dH;
 }
 obj.style.display="";
}