var win=null;
//abre popup com imagem do artigo
function Popup(imURL) { 
	closeWin();
	win = window.open( "popup.html?"+imURL, "Artigo","height=100,width=100,top=50,left=150,resizable=no,status=no,toolbar=no,scrollbars=no"); 
	win.focus();  
} 
//fecha popup do artigo
function closeWin(){
	  if(win && ! win.closed && win.open){
		  win.close();
		  win=null;
	  }
}