diff --git a/src/registrar/assets/js/get-gov-admin.js b/src/registrar/assets/js/get-gov-admin.js
new file mode 100644
index 000000000..d7d589214
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+++ b/src/registrar/assets/js/get-gov-admin.js
@@ -0,0 +1,37 @@
+/**
+ * @file get-gov-admin.js includes custom code for the .gov registrar admin portal.
+ *
+ * Constants and helper functions are at the top.
+ * Event handlers are in the middle.
+ * Initialization (run-on-load) stuff goes at the bottom.
+ */
+
+// <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
+// Helper functions.
+/** Either sets attribute target="_blank" to a given element, or removes it */
+function openInNewTab(el, removeAttribute = false){
+    if(removeAttribute){
+        el.setAttribute("target", "_blank");
+    }else{
+        el.removeAttribute("target", "_blank");
+    }
+};
+
+// <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
+// Event handlers.
+
+// <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
+// Initialization code.
+
+/** An IIFE for pages in DjangoAdmin which may need custom JS implementation.
+ * Currently only appends target="_blank" to the domain_form object,
+ * but this can be expanded.
+*/
+(function prepareDjangoAdmin(){
+    let domainFormElement = document.getElementById("domain_form");
+    let domainSubmitButton = document.getElementById("manageDomainSubmitButton");
+    if(domainSubmitButton && domainFormElement){
+      domainSubmitButton.addEventListener("mouseover", () => openInNewTab(domainFormElement, true));
+      domainSubmitButton.addEventListener("mouseout", () => openInNewTab(domainFormElement, false));
+    }
+})();
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