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js: If the HTML contains a dialogue-box form, delete it

This is so that (given time for caches to expire) I can switch to having
a persistent dialogue box in HTML rather than fabricating it from
scratch in JavaScript each time it's used.

--- a/emccpre.js

+++ b/emccpre.js

@@ -190,6 +190,13 @@

 // Dialog-box functions called from both C and JS.

 function dialog_init(titletext) {

+    // Forward compatibility: Delete form and dimmer if they already

+    // exist.

+    dlg_dimmer = document.getElementById("dlgdimmer");

+    if (dlg_dimmer) dlg_dimmer.parentElement.removeChild(dlg_dimmer);

+    dlg_form = document.getElementById("dlgform");

+    if (dlg_form) dlg_form.parentElement.removeChild(dlg_form);

+

     // Create an overlay on the page which darkens everything

     // beneath it.

     dlg_dimmer = document.createElement("div");