I managed to get one of your scripts out of it :
"var xmlHttp;
2var div;
3
4function Registration()
5{
6xmlHttp=GetXmlHttpObject();
7if (xmlHttp==null)
8 {
9 alert ("Browser does not support HTTP Request");
10 return;
11 }
12div = "mainbody";
13document.getElementById(div).innerHTML="Loading please wait...<br/><b>T R I B A L C O R P";
14var url="register/main.php";
15url=url+"?sid="+Math.random();
16xmlHttp.onreadystatechange=stateChanged;
17xmlHttp.open("GET",url,true);
18xmlHttp.send(null);
19}
20
21function ShowCopyright()
22{
23xmlHttp=GetXmlHttpObject();
24if (xmlHttp==null)
25 {
26 alert ("Browser does not support HTTP Request");
27 return;
28 }
29div = "copyright";
30document.getElementById(div).innerHTML="Loading please wait...<br/><b>T R I B A L C O R P";
31var url="copyright.php";
32url=url+"?sid="+Math.random();
33xmlHttp.onreadystatechange=stateChanged;
34xmlHttp.open("GET",url,true);
35xmlHttp.send(null);
36}
37
38function Advertise()
39{
40xmlHttp=GetXmlHttpObject();
41if (xmlHttp==null)
42 {
43 alert ("Browser does not support HTTP Request");
44 return;
45 }
46div = "mainbody";
47document.getElementById(div).innerHTML="Loading please wait...<br/><b>T R I B A L C O R P";
48var url="advertise.php";
49url=url+"?sid="+Math.random();
50xmlHttp.onreadystatechange=stateChanged;
51xmlHttp.open("GET",url,true);
52xmlHttp.send(null);
53}
54
55function HideCopyright()
56{
57xmlHttp=GetXmlHttpObject();
58if (xmlHttp==null)
59 {
60 alert ("Browser does not support HTTP Request");
61 return;
62 }
63div = "copyright";
64document.getElementById(div).innerHTML="<a href=# onclick=ShowCopyright() >Legal and Advertising</a>";
65}
66
67function mainhome()
68{
69xmlHttp=GetXmlHttpObject();
70if (xmlHttp==null)
71 {
72 alert ("Browser does not support HTTP Request");
73 return;
74 }
75div = "mainbody";
76document.getElementById(div).innerHTML="Logged in. Welcome, " + sessionname;
77}
78
79function stateChanged()
80{
81if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
82 {
83 document.getElementById(div).innerHTML=xmlHttp.responseText;
84 }
85}
86
87function GetXmlHttpObject()
88{
89var xmlHttp=null;
90try
91 {
92 // Firefox, Opera 8.0+, Safari
93 xmlHttp=new XMLHttpRequest();
94 }
95catch (e)
96 {
97 // Internet Explorer
98 try
99 {
100 xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
101 }
102 catch (e)
103 {
104 xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
105 }
106 }
107return xmlHttp;
108}"
This one makes me think that register/main.php is it but I can't be sure... Are you using a URL rewrite with .htaccess?