function rollOverTab(state, style, object_id) {
	
	state = state || '';
	style = style || '';
	
	if(state == "over") {
		document.getElementById(style+'tab_nav-start'+object_id).className = style+"tab_nav-start-over";
		document.getElementById(style+'tab_nav-main'+object_id).className = style+"tab_nav-main-over";
		document.getElementById(style+'tab_nav-end'+object_id).className = style+"tab_nav-end-over";
	}
	else if(state == "on") {
		document.getElementById(style+'tab_nav-start'+object_id).className = style+"tab_nav-start-on";
		document.getElementById(style+'tab_nav-main'+object_id).className = style+"tab_nav-main-on";
		document.getElementById(style+'tab_nav-end'+object_id).className = style+"tab_nav-end-on";
	}
	else {
		document.getElementById(style+'tab_nav-start'+object_id).className = style+"tab_nav-start";
		document.getElementById(style+'tab_nav-main'+object_id).className = style+"tab_nav-main";
		document.getElementById(style+'tab_nav-end'+object_id).className = style+"tab_nav-end";
	}
}