In order to redirect the URL, you need to use an ASP.NET Redirect file.
Here's an example:
You have www.Foo.com/SomeFolder and you want to redirect it to www.Foo.com/tabid/55/default.aspx
To do this you would:
1) Log into Foo.com's FTP.
2) Go to the /httpdocs/ folder
3) Create a folder named SomeFolder.
4) Create a file in this folder named "Index.aspx" with this content:
-----------------------------------
<script runat="server" Language="C#">
private void Page_Load(object sender, System.EventArgs e)
{
Response.Status = "301 Moved Permanently";
Response.AddHeader("Location","http://www.Foo.com/tabid/55/default.aspx");
}
</script>
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When you browse to the old URL, you will now get redirected to the new URL.