//<a href="javascript:show('wp');">

function show(div) {
  if (document.getElementById)
     document.poppedLayer = eval('document.getElementById(div)');
  else if (document.all)
     document.poppedLayer = eval('document.all[div]');
  else
     document.poppedLayer = eval('document.layers[div]');
 
 if(document.poppedLayer.style.display == "block"){
 document.poppedLayer.style.display = "none";
 }
 else{
 document.poppedLayer.style.display = "block";
 }  
}