diff --git a/admin/panels/config/admin.config.tpl b/admin/panels/config/admin.config.tpl
index 227b248..8f96b42 100755
--- a/admin/panels/config/admin.config.tpl
+++ b/admin/panels/config/admin.config.tpl
@@ -91,7 +91,7 @@
 		
 		<dt><label for="timeoffset"> {$panelstrings.timeoffset} </label></dt>
 		<dd><input type="text" name="timeoffset" id="timeoffset" 
-			class="smalltextinput{$error.maxentries|notempty:" field-error"}" 
+			class="smalltextinput{$error.timeoffset|notempty:" field-error"}" 
 			value="{$fp_config.locale.timeoffset}" /> {$panelstrings.hours} 
 		</dd>
 
diff --git a/fp-includes/smarty/plugins/validate_criteria.isNumber.php b/fp-includes/smarty/plugins/validate_criteria.isNumber.php
index 1d0c20d..fc20517 100644
--- a/fp-includes/smarty/plugins/validate_criteria.isNumber.php
+++ b/fp-includes/smarty/plugins/validate_criteria.isNumber.php
@@ -37,7 +37,7 @@ function smarty_validate_criteria_isNumber($value, $empty, &$params, &$formvars)
     if(strlen($value) == 0)
         return $empty;        
 
-    return preg_match('!^\d+(\.\d+)?$!', $value);
+    return preg_match('!^-?\d+(\.\d+)?$!', $value);
 }
 
 ?>