var DHTML = (document.getElementById || document.all || document.layers);

function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
	this.obj = document.all[name];
	this.style = document.all[name].style;
  }
  else if (document.layers)
  {
   	this.obj = document.layers[name];
   	this.style = document.layers[name];
  } 
  else this.exists = false;
}

function hide_popup() {
 var div = new getObj('news'); 
 div.style.visibility = 'hidden';
}                                

function show_popup() {
	w = 650;          
	h = 610;

	l=(screen.availWidth/2)-(w/2)
	t=(screen.availHeight/2)-(h/2)
	                        
	var div = new getObj('news');
	div.style.visibility = 'visible';
	div.style.top = t;   
	div.style.left = l;  	
}