How to convert this jquery code into simple javascript

var $jt = jQuery.noConflict();

$jt(function($) {

    $jt('.tabs a').click(function(){
        switch_tabs($jt(this));
        return false;
    });

    switch_tabs($jt('.defaulttab'));

});

function switch_tabs(obj)
{
    $jt('.tab-content').hide();
    $jt('.tabs a').removeClass("selected");
    var id = obj.attr("rel");

    $jt('#'+id).show();
    obj.addClass("selected");
}

I want to use same effect without the need of jquery

If i remove jquery and place simple javascript , functionality should remain