diff --git a/webif/html/diag/diag.jim b/webif/html/diag/diag.jim
index 5bf875f..18fa276 100755
--- a/webif/html/diag/diag.jim
+++ b/webif/html/diag/diag.jim
@@ -136,13 +136,15 @@ puts {
 
 source /mod/webif/html/log/_lib.jim
 foreach file [lsort -command logsort $loglist] {
+	set act clear
+	if {[string match {*.[0-9][0-9][0-9][0-9]*} $file]} { set act unlink }
 	puts "
 	    <img border=0 height=14 src=/images/421_1_00_CH_Title_2R_Arrow.png>
 	    <a href=\"../log/?log=[cgi_quote_url $file]\">
 	    	[file tail $file]
 	    </a>
 	    (<span class=lsize>[pretty_size [file size $file]]</span>)
-	    <a class=\"va footnote logclear\" href=# file=\"$file\">
+	    <a class=\"va footnote logclear\" act=$act href=# file=\"$file\">
 	    <img class=va border=0 src=/img/close.png width=20>Clear</a>
 	    <br>"
 }
diff --git a/webif/html/diag/script.js b/webif/html/diag/script.js
index 77a0652..f4e8f95 100644
--- a/webif/html/diag/script.js
+++ b/webif/html/diag/script.js
@@ -85,12 +85,17 @@ $('a.logclear').on('click', function(e) {
 
 	var $t = $(this);
 	var file = $t.attr('file');
+	var act = $t.attr('act');
 
-	if (!confirm('Delete ' + file + '?'))
+	if (act == 'clear')
+		t = 'Truncate';
+	else
+		t = 'Delete';
+	if (!confirm(t + ' ' + file + '?'))
 		return;
 
 	chunked_request('Clearing log <i>' + file + '</i>',
-	    '/log/act.jim', { action: 'clear', file: file });
+	    '/log/act.jim', { action: act, file: file });
 });
 
 $.getJSON('/diag/rpc.jim?act=getall', function(data) {