Automatically Search "not More Than" Advanced Search Page

PHPRunner 6.2 Build 15275
I have an advanced search Page with 1 date. I need to set the search page to default values: Not checkbox selected, Option: More than and value: sysdate.
I used the code from post 17530 and i adapted it:
var name='Selectiedatum';

var name1=name.replace(' ','_');
$("#srchOpt1"+name1).val('More than');

$("#srchOpt1"+name1).trigger('change');

var ctrl = Runner.getControl(pageid, name);

var d1 = new Date();

d1.setDate(d1.getDate());

ctrl.setValue(d1);

1. How can I set the NOT-checkbox selected?
   
2. How can I archieve the same effect using the Javscript API SearchController and SearchField Objects? I tried a lot of combinations but I can't get it working.