function loadBar(fl)
//fl is show/hide flag
{
    var x, y;
    if (self.innerHeight) {// all except Explorer
        x = self.innerWidth;
        y = self.innerHeight;
    }
    else
        if (document.documentElement && document.documentElement.clientHeight) {// Explorer 6 Strict Mode
        x = document.documentElement.clientWidth;
        y = document.documentElement.clientHeight;
    }
    else
        if (document.body) {// other Explorers
        x = document.body.clientWidth;
        y = document.body.clientHeight;
    }

    var el = document.getElementById('loader');
    if (null != el) {
        var top = (y / 2) - 20;
        var left = (x / 2) - 150;
        if (left <= 0) left = 10;
        el.style.visibility = (fl == 1) ? 'visible' : 'hidden';
        el.style.display = (fl == 1) ? 'block' : 'none';
        el.style.left = left + "px"
        el.style.top = top + "px";
        el.style.zIndex = 2;
    }
}