Golang templates fails using relative paths

Question

I just don't understand Go templates and relative paths...

Using the following directory structure:

Application Directory
  program.go
  program executable
-- css
     program.css
-- pages
     index.gohtml
     wartree.gohtml

At this point, my templates are pure html that has been in use in different environments for several years.

I have the following Go code:

package main

import (
    "fmt"
    "log"
    "net/http"
    "html/template"
)

func main() {
    http.HandleFunc("/", index)
    http.HandleFunc("/wartree", wartree)

    log.Fatal(http.ListenAndServe(":8080", nil))
}


func index(w http.ResponseWriter, r *http.Request) {
    fmt.Println("Index has been called...")

    tmpl := template.Must(template.ParseGlob("pages/*"))
    tmpl.Execute(w, nil)
}

func wartree(w http.ResponseWriter, r *http.Request) {
    fmt.Println("wartree has been called...")

    tmpl := template.Must(template.ParseFiles("wartree.gohtml"))
    tmpl.Execute(w, nil)
}

Both templates have the following line in the HTML template heads...<link href="css/nav.css" type="text/css" media="screen" />

When I execute the program, the css is not used and I cannot call the Wartree template. It just calls index again???

I even tried changing the path to the css to be absolute but that made no difference, and I see no errors from Go or the browser.

I just simply don't get Go templates and paths. I guess.