function neGet(id) {
        return document.getElementById(id);
    }

    function neToggle(id) {
        var el = neGet(id).style;
        el.display = ('none' == el.display) ? '' : 'none';
    }
    
    
    function usleep(s) {
        var now = new Date();
        var to = now.getTime()+s;
        while(now.getTime()<to) {
            now = new Date();
        }
        return;
    }

    function sleep(sec) {
        usleep(sec*1000);
        return;
    }

    function rgb(r,g,b) {
        var rr = parseInt(r).toString(16);
        var gg = parseInt(g).toString(16);    
        var bb = parseInt(b).toString(16);
        if(rr.length<2) rr='0'+rr;
        if(gg.length<2) gg='0'+gg;
        if(bb.length<2) bb='0'+bb;
        var rgb = '#'+rr+gg+bb;
        return rgb;
    }