basic url validation/file name validation

TODO.txt

@@ -2,14 +2,15 @@ TODO:
 
 key: + = to add, - = to remove, x = completed, # = comment
 
-+Append extensions to file name in save dialog unless exists
+xAppend extensions to file name in save dialog unless exists
 +Add option for multiple audio formats
 +Dynamic libraries
 +Create custom url entry dialog
-+Url validation
+xUrl validation
 +Percentage in progress bar
 +Replace spaces in file name with dashes/underscores
 +Make cancel button exit in url dialog
 +Create dialog asking to play finished file or not
 +Display current action in progressbar instead of youtube link itself
++Fix progress bar cancel button
 #possibly more later