var bV=parseInt(navigator.appVersion);
var isNS=(document.layers) ? true : false;
var isIE=((document.all)&&(bV >= 4))?true:false;

function show(obj){
    if(obj == null)
        return null;

        var status = obj.style.display;
        expand(obj);
}
function expand(element) 
{
 if(isIE || isNS6 ){ 
 	element.style.display = "block";
 }
 
 else if( isNS ) 
       element.visibility = "show";
}
function hide(element) 
{
  if(isIE || isNS6 ) {
        element.style.display = "none";
  }     
  else if( isNS ) {
     element.visibility == "hide" 
 }
}

    function toggle_visibility(id,status) {
       var e = document.getElementById(id);
       if(status == 'N')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }