/**
 *  简单的tab页切换
 */  
function simpletab(titles, contents) {
    var titleelems = $$(titles);
    var contentelems = $$(contents);
    
    if (!titleelems.length) {
		return false;	
	}
    
    titleelems[0].addclass('active');
    contentelems.setstyle('display', 'none');
    contentelems[0].setstyle('display', 'block');
    
    titleelems.each(function(titleelem, index) {
        titleelem.addevent('click', function(e) {
        	e.stop();
            titleelems.removeclass('active');
            titleelems[index].addclass('active');
            contentelems.setstyle('display', 'none');
            contentelems[index].setstyle('display', 'block');    
        });
    });
}