function setClassName(objId, className) {
    	document.getElementById(objId).className = className;
}

function ap_showContent(tab) {
	for (var i = 1; i <= ap_numTabs; i++) {
		if (i != tab) {
			//$('ap_box_tab_'+i).class = "item";
            setClassName('ap_box_tab_'+i, "item");
            document.getElementById('ap_box_content_'+i).style.display = "none";
		}
	}
	//$('ap_box_tab_'+tab).class = "item_on";
    setClassName('ap_box_tab_'+tab, "item_on");
    document.getElementById('ap_box_content_'+tab).style.display = "block";
}

function ap_init() {
	ap_numTabs=3;
	ap_showContent(ap_dt);
}

// add to list of functions which run on window load
womAdd('ap_init()');