var inheight  = window.innerHeight;
var inwidth   = window.innerWidth;
var outheight = window.outerHeight;
var outwidth  = window.outerWidth;

function anzeigen(in_id){
 if(document.getElementById(in_id).style.display=='none') 
 	document.getElementById(in_id).style.display='block'; 
 else
 	document.getElementById(in_id).style.display='none';
}