function select_tab_process(num) {
	tabs = $$('.simple_tab');
	contents = $$('.simple_tab_content');
	for (i=0; i<tabs.length;i++) {
		tabs[i].removeClassName('simple_tab_selected');
		contents[i].removeClassName('simple_tab_content_visible');
	}
	$('simple_tab_'+num).addClassName('simple_tab_selected');
	$('simple_tab_content_'+num).addClassName('simple_tab_content_visible');
}