function ajaxManager()
	{
	var args = ajaxManager.arguments;
	switch (args[0])
		{
		case "load_page":
		if (document.getElementById) {
			var x = (window.ActiveXObject) ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
			}
			if (x)
				{
			x.onreadystatechange = function()
					{
				if (x.readyState == 4 && x.status == 200)
						{
						el = document.getElementById(args[2]);
						el.innerHTML = x.responseText;
					}
					}
				x.open("GET", args[1], true);
				x.send(null);
				}
			break;
		case "start_up":
			ajaxManager('load_page', 'navigation1.xml', 'contentLYR');
			break;
		case "mainpage":
		        ajaxManager('load_page', 'navigation1.xml', 'contentLYR');
  			break;
		case "research":
		        ajaxManager('load_page', 'navigation2.xml', 'contentLYR');
  		        break;
		case "publications":
		        ajaxManager('load_page', 'navigation3.xml', 'contentLYR');
  		        break;
		case "teaching":
		        ajaxManager('load_page', 'navigation4.xml', 'contentLYR');
  		        break;
		case "personal":
		        ajaxManager('load_page', 'navigation5.xml', 'contentLYR');
  		        break;
		case "links":
		        ajaxManager('load_page', 'navigation5.xml', 'contentLYR');
  		        break;


		}
	}