function setCheck(obj)
{
if (obj.checked)
     {
          obj.firstChild.innerHTML = ""
     }
     else
     {
          obj.firstChild.innerHTML = "a"
     }
obj.checked =!obj.checked;
}

function showhide(id){ 
if (document.getElementById){ 
obj = document.getElementById(id); 
if (obj.style.display == "none"){ 
obj.style.display = ""; 
} else { 
obj.style.display = "none"; 
} 
} 
} 

function hide(id){ 
if (document.getElementById){ 
obj = document.getElementById(id); 
obj.style.display = "none"; 
} 
} 

function show(id){ 
if (document.getElementById){ 
obj = document.getElementById(id); 
obj.style.display = ""; 
} 
}