Edit in JSFiddle

this.t_tip = function() {
    this.xOffset = -10; 
    this.yOffset = 20;        
    $(".tooltip").unbind().hover(
        function(e) {
            this.t = this.title;
            this.title = '';
            this.top = (e.pageY + yOffset); 
            this.left = (e.pageX + xOffset);
            $('body').append( '<span id="tip_body">' + this.t + '</span>' );
            $('#tip_body').css("top", this.top+"px").css("left", this.left+"px").fadeIn("farst");
        },
        function() {
            this.title = this.t;
            $("#tip_body").remove();
        }
    ).mousemove(
        function(e) {
            this.top = (e.pageY + yOffset);
            this.left = (e.pageX + xOffset);
            $("#tip_body").css("top", this.top+"px").css("left", this.left+"px");
        }
    );            
};
jQuery(document).ready(function($){t_tip();}) 

p{font-size:12px; line-height:16px;}
a{color:red ;}

#tip_body { 
    display: none; 
    position: absolute; 
    padding: 10px; 
    left: 5px; 
    font-size: 0.8em; 
    background-color: #333; 
    color:#fff;
    border: 1px solid red; 
    opacity: 0.9 ;
    filter:progid:DXImageTransform.Microsoft.Alpha(Enabled=1,Style=0,Opacity=90) ;
    -moz-border-radius: 5px; 
    -webkit-border-radius: 5px; 
    z-index: 9999； }

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<p>The theme is free for personal and commercial use. Attribution is not necessary, but certainly appreciated.</p>