adding the ability for form_open_multipart() to accept string attribute arguments
diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index c78b805..60d2631 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -84,7 +84,15 @@
 {
 	function form_open_multipart($action, $attributes = array(), $hidden = array())
 	{
-		$attributes['enctype'] = 'multipart/form-data';
+		if (is_string($attributes))
+		{
+			$attributes .= ' enctype="multipart/form-data"';
+		}
+		else
+		{
+			$attributes['enctype'] = 'multipart/form-data';
+		}
+
 		return form_open($action, $attributes, $hidden);
 	}
 }