function changeW(mypic,xw,xl){ 
 var oImgPos = document.getElementById("imgTable");
   
   
 var width = mypic.width;
 var height = mypic.height;
  
 var tW;
 var tH;
 
 if (width>height){
  
 tW=xw;
 tH=height*xw/width;
  }
 else
 {tH=xl;
 tW=width*xl/height;
 }
 mypic.width=tW;
 mypic.height=tH;
 

 
}