- resizing of the graph now works!
- combo-box for selecting the provider
	-> providers come from php-script, hardcoded but later from DB
	-> when changing the combo-box ajax-request to php, putting HLZF to
JSON depending on the provider, then back to JS for editing the Graph!
(again hardcoded, but for the moment enough)
--> changing the marked area in the graph when selecting provider with
HLZF will follow!