A quick inspection tells me you need to change the css declaration
.ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited
and
.ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited
As for the default tab, you can do something like below:
$('#myAccordionId').accordion({}).accordion("activate" , indexOrSelector)
mmhan
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