var flag=false; 
function DrawImage(ImgD){ 
 var image=new Image(); 
 image.src=ImgD.src; 
 if(image.width>0 && image.height>0){ 
  flag=true; 
  if(image.width/image.height>= 100/100){ 
   if(image.width>100){
    ImgD.width=100; 
    ImgD.height=(image.height*100)/image.width; 
   }else{ 
    ImgD.width=image.width;
    ImgD.height=image.height; 
   } 

  } 
  else{ 
   if(image.height>100){
    ImgD.height=100; 
    ImgD.width=(image.width*100)/image.height; 
   }else{ 
    ImgD.width=image.width;
    ImgD.height=image.height; 
   } 

  } 
 }
}

function xshow(id){
	var t = document.getElementById(id);
	t.style.visibility = "visible";
}

function xhidd(id){
	var t = document.getElementById(id);
	t.style.visibility = "hidden";
}

function xswitch(id){
	var t = document.getElementById(id);
	t.style.display = t.style.display == "none" ? "block" : "none";
}