Index: app/views/issues/new.html.erb
===================================================================
--- app/views/issues/new.html.erb	(revision 7885)
+++ app/views/issues/new.html.erb	(working copy)
@@ -23,5 +23,6 @@
 
 <% content_for :header_tags do %>
     <%= stylesheet_link_tag 'scm' %>
+    <%= javascript_include_tag "dups.js" %>
     <%= robot_exclusion_tag %>
 <% end %>
Index: public/javascripts/dups.js
===================================================================
--- public/javascripts/dups.js	(revision 0)
+++ public/javascripts/dups.js	(revision 0)
@@ -0,0 +1,86 @@
+var timSearchSimilar = null;
+var simelement = null;
+var lastquery = "";
+
+function updateSimilarIssues(element, response)
+{
+	var pat = new RegExp(/<a href=\"(\/[a-z]+)?\/issues\/(\d+)\">(.*?) #(\d+) \(([^\)]+)\)\: (.+?)<\/a>/gi);
+
+	var result;
+        var similarhtml = '';
+        while ((result = pat.exec(response)) != null) 
+        {
+		similarhtml = similarhtml+ "<tr><td><a target=\"_blank\" href=\"" + result[1] + "/issues/" + result[2] + "\">" + result[3] + " #" + result[2]+"</a></td><td>"+result[6]+"</td><td>"+result[5]+"</td></tr>";
+	}
+
+	// NOTE: IE seems to have issues updating elements with HTML and prototype, so this is the only way I could make it work
+	if (simelement !== null)
+	{
+		simelement.remove();
+	}
+	
+	simelement = new Element("div")
+	element.insert({after:simelement });
+	
+		
+	if (similarhtml) 
+	{
+		var divhtml = "<div id='similarissues' style='padding: 5px 0 8px 180px;'><label>Did you mean?<br><span style='font-size:10px; line-height: normal; font-weight: normal'>These issues already exist</span></label><table style='line-height: 1em'>"+similarhtml+"</table></div>";
+		simelement.insert(divhtml);
+	}
+}
+
+function scheduleDupIssueSearch(element)
+{
+	var thisquery = element.getValue();
+	
+	if (thisquery == null || thisquery == undefined || lastquery == thisquery)
+	{
+		return;
+	}
+	
+	lastquery = thisquery;
+	
+	clearTimeout(timSearchSimilar);
+	timSearchSimilar = setTimeout(function() { searchDupIssues(element); }, 400);
+}
+
+function searchDupIssues(element)
+{
+    var proj = location.href.replace(/^.*\/projects\/([^\/]+)\/issues.*$/, '$1');
+    var url = "../../../search/index/"+proj+"?issues=1&q="+escape(element.getValue());
+    new Ajax.Request(url, {
+    	method: 'get',
+    	onSuccess: function(transport)
+    	{
+    		updateSimilarIssues(element, transport.responseText);
+    	}    	
+    });
+
+}
+
+function findDupIssues()
+{
+
+	$$(".new-issue-form #issue_subject").each(function(element)
+	{
+		element.setAttribute("autocomplete", "off");
+		element.observe('keyup', function() {
+			scheduleDupIssueSearch(element);
+        	});
+        	
+
+                element.observe('change', function() {
+                     scheduleDupIssueSearch(element);
+                });        	
+		
+	});
+	
+}
+
+document.observe('dom:loaded', function(){
+	findDupIssues();
+});
+
+
+