var tooltip=function()
{
    var id = 'tooltip';
    var top = 3;
    var left = 3;
    var speed = 10;
    var timer = 20;
    var endalpha = 95;
    var alpha = 0;
    var tt,t,c,b,h;
    var ie = document.all ? true : false;
    return{
        show:function()
        {
            if(tt == null)
            {
                tt = document.getElementById(id);
                if (!ie)
                {
                  tt.style.opacity = 0;
                  tt.style.filter = 'alpha(opacity=0)';
                }
                document.onmousemove = this.pos;
            }
            tt.style.display = 'block';
            h = parseInt(tt.offsetHeight) + top;
            if (!ie)
            {
              clearInterval(tt.timer);
              tt.timer = setInterval(function(){tooltip.fade(1)},timer);
            }
        },
        pos:function(e)
        {
            var u = ie ? event.clientY + document.documentElement.scrollTop : e.pageY;
            var l = ie ? event.clientX + document.documentElement.scrollLeft : e.pageX;
            tt.style.top = (u - h) + 'px';
            tt.style.left = (l + left) + 'px';
        },
        fade:function(d)
        {
            var a = alpha;
            if ((a != endalpha && d == 1) || (a != 0 && d == -1))
            {
                var i = speed;
                if(endalpha - a < speed && d == 1)
                {
                    i = endalpha - a;
                }else if(alpha < speed && d == -1)
                {
                    i = a;
                }
                alpha = a + (i * d);
                tt.style.opacity = alpha * .01;
                tt.style.filter = 'alpha(opacity=' + alpha + ')';
            }
            else
            {
              clearInterval(tt.timer);
              if (d == -1)
              {  
                alert(alpha);
                tt.style.display = 'none'
              }
            }
        },
        hide:function()
        {
           if (!ie)
           {
             alpha = 0;
             tt.style.opacity = 0;
             tt.style.filter = 'alpha(opacity=0)';
           }
           tt.style.display = 'none';
       }
    };
}();