[svn r11631] bugfix: SQL error when editing a link

http://www.dokeos.com/forum/viewtopic.php?p=33820#33820

main/link/linkfunctions.php

@@ -228,7 +228,6 @@ function editlinkcategory($type)
 	global $title;
 	global $description;
 	global $category;
-		global $onhomepage;
 	global $selectcategory;
 	global $description;
 	global $category_title;
@@ -255,6 +254,15 @@ function editlinkcategory($type)
 		// this is used to put the modified info of the link-form into the database
 		if ($_POST['submitLink'])
 		{
+			if ($_POST['onhomepage'] = '')
+			{
+				$onhomepage = 0;
+			}
+			else
+			{
+				$onhomepage = $_POST['onhomepage'];
+			}
+
 			// finding the old category_id
 			$sql = "SELECT * FROM ".$tbl_link." WHERE id='".$_POST['id']."'";
 			$result = api_sql_query($sql, __FILE__, __LINE__);