if (document.images)
{
  pic1= new Image(600,333); 
  pic1.src="images/map/1.gif"; 

  pic2= new Image(600,333); 
  pic2.src="images/map/2.gif";

  pic3= new Image(600,333); 
  pic3.src="images/map/3.gif"; 

  pic4= new Image(600,333); 
  pic4.src="images/map/4.gif";
}

function zoom(map) {
	var mapon = "map" + map;
	var mapoff;
	for (var i=1;i<5;i++) {
		mapoff = "map" + i;
		document.getElementById(mapoff).style.display='none';
		}
		document.getElementById(mapon).style.display='inline';
}