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var xmlhttp=false;/*@cc_on @*//*@if (@_jscript_version >= 5)// JScript gives us Conditional compilation, we can cope with old IE versions.// and security blocked creation of the objects. try {  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {  try {   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");  } catch (E) {   xmlhttp = false;  } }@end @*/if (!xmlhttp && typeof XMLHttpRequest!='undefined') {	try {		xmlhttp = new XMLHttpRequest();	} catch (e) {		xmlhttp=false;	}}if (!xmlhttp && window.createRequest) {	try {		xmlhttp = window.createRequest();	} catch (e) {		xmlhttp=false;	}}var isLoading = false;function changeTab(file, current) {	if(isLoading == true) { return; }	isLoading = true;  if(current != undefined) {		/* "close" all tabs */		var menuItems = document.getElementById('menuItem').getElementsByTagName('a');		for(var i=0;i<menuItems.length;i++) {			menuItems[i].className = "";		}		/* open pressed tab */		current.className = 'selected';		current.blur();	}	/* set please wait to content */  var content = document.getElementById('content')	content.innerHTML = "<br /><br /><center>Loading.<br /><img src='style/gfx/loading.gif' alt='Loading page' /></center><br /><br />";		/* create file */	var fullFile = "pages/page_"+file+".php";		/* fetch file requested */	xmlhttp.open("GET", fullFile, true);	xmlhttp.onreadystatechange = function() {		if (xmlhttp.readyState==4) {			document.getElementById('content').innerHTML = xmlhttp.responseText;			isLoading = false;		}	}	xmlhttp.send(null)}