I do change the text on the mobileselectmenu1 with the following code.
$("select[dsid='mobileselectmenu1']").find("option").removeAttr("selected").parent().find("option:contains('Dutch')").attr("selected","selected").parent().selectmenu("refresh");
After this code is run and make a new selection, the event: value change, custom java script does not work anymore.
It only starts working again after i have selected the top value.