function toggle(linkID){
    //toggles visibility on element with name = pageID - "Link"
    
    var paneID = linkID.substring(0,linkID.lastIndexOf("Link"));
    //alert("toggling pane "+paneID);
    var link = document.getElementById(linkID);
    var pane = document.getElementById(paneID);
    //alert("got pane "+pane+", link "+link);
    
    if (pane != null){
       //alert("pane.style.display:"+pane.style.display);
     	 if (pane.style.display == "block") {
     	 		pane.style.display = "none";
     	 		link.value = "Max +";
     	 }
     	 else {
     	  	pane.style.display = "block";
     	  	link.value = "Min -";
     	 }
    }
    return false;
 }