//image rollover for toc arrows
function highlight(obj){
	var source=obj.src;
	var i=source.indexOf(".jpg");
	if(source.indexOf("_highlight.jpg")==-1 && i!=-1){
		source=source.substring(0,i);
		obj.src=source+"_highlight.jpg";
	}
}
function unhighlight(obj){
	var source=obj.src;
	var i=source.indexOf("_highlight.jpg");
	if(i!=-1){
		source=source.substring(0,i);
		obj.src=source+".jpg";
	}
}


//this function displays or hides object t -- IE only
function toggle(t) {
	var x=document.getElementById(t);
  if (x.style.display != "none")
    x.style.display = "none";
  else
    x.style.display = "inline";
}

function test(div,pic) {
  var d, p;
  if (document.getElementById) { // DOM-compliant browsers
    d=document.getElementById(div);
    p=document.getElementById(pic);
  }
  if (d.style.display == "block") {
    d.style.display="none";
    p.src="/images/shut_highlight.jpg";
  } else {
    d.style.display="block";
    p.src="/images/open_highlight.jpg";
  }
}