is_w3c = (document.getElementById) ? true : false;
is_ns = (document.layers) ? true : false;
is_ie = (document.all) ? true : false;
is_ie4 = is_ie && !is_w3c;
is_ok = is_ie || is_w3c;

if (is_ok) {            

}

function initmenu(){
	var x = document.getElementsByTagName('div');
	
	if (!is_ok) return;
	
	for (var i=0;i<x.length;i++)
	{
		if (x[i].className == 'submenu')
			x[i].style.display = "none";
	}	
}


function openmenu(which){
  if(!is_ok) return;
  
  if(is_w3c){
    obj = document.getElementById(which).style;
  } else {
    obj = document.all[which].style;
  }
  obj.display = 'block';
}

function closemenu(which){
  if(!is_ok) return;
  
  if(is_w3c){
    obj = document.getElementById(which).style;
  } else {
    obj = document.all[which].style;
  }
  obj.display = 'none';
}

function toggle(which){
  if(!is_ok) return;
  
  if(is_w3c){
    obj = document.getElementById(which).style;
  } else {
    obj = document.all[which].style;
  }
  if(obj.display == 'block'){
    obj.display = 'none';
  } else {
    obj.display = 'block';
  }
}