var tooltip=function(){
    var id = 'tt';
    var top = 3;
    var left = 3;
    var maxw = 300;
    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(v,w){
            if(tt == null){
                tt = document.createElement('div');
                tt.setAttribute('id',id);
                t = document.createElement('div');
                t.setAttribute('id',id + 'top');
                c = document.createElement('div');
                c.setAttribute('id',id + 'cont');
                b = document.createElement('div');
                b.setAttribute('id',id + 'bot');
                tt.appendChild(t);
                tt.appendChild(c);
                tt.appendChild(b);
                document.body.appendChild(tt);
                tt.style.opacity = 0;
                tt.style.filter = 'alpha(opacity=0)';
            }
            tt.style.display = 'block';
            c.innerHTML = v;
            tt.style.width = w ? w + 'px' : 'auto';
            if(!w && ie){
                t.style.display = 'none';
                b.style.display = 'none';
                tt.style.width = tt.offsetWidth;
                t.style.display = 'block';
                b.style.display = 'block';
            }
            if(tt.offsetWidth > maxw){tt.style.width = maxw + 'px'}
            h = parseInt(tt.offsetHeight) + top;
            clearInterval(tt.timer);
            tt.timer = setInterval(function(){tooltip.fade(1)},timer);
            document.onmousemove = this.pos;
        },
        pos:function(e){
            var u = ie ? event.clientY + (document.documentElement.scrollTop || document.body.scrollTop) : e.pageY;
            var l = ie ? event.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft) : e.pageX;
            tt.style.top = (u - h) + 'px';

            //opera Netscape 6 Netscape 4x Mozilla
            if (window.innerWidth || window.innerHeight){
                docwidth = window.innerWidth;
                docheight = window.innerHeight;
            }
            //IE Mozilla
            if (document.body.clientWidth || document.body.clientHeight){
                docwidth = document.body.clientWidth;
                docheight = document.body.clientHeight;
            }

            if ((l + left + tt.offsetWidth) > docwidth) {
                tt.style.left = (l - (left + tt.offsetWidth)) + 'px';
            }
            else {
                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) {
                    tt.timer = setInterval(function(){tooltip.nomove()},timer);
                    tt.style.display = 'none';
                }
            }
        },
        hide:function(){
            clearInterval(tt.timer);
            tt.timer = setInterval(function(){tooltip.fade(-1)},timer);
        },
        nomove:function(){
            clearInterval(tt.timer);
            document.onmousemove = null;
        }
    };
}();