You can also achieve this completely without jQueryUI by using CSS styles. See the snippet below:
div#Tooltip_Text_container {_x000D_
max-width: 25em;_x000D_
height: auto;_x000D_
display: inline;_x000D_
position: relative;_x000D_
}_x000D_
_x000D_
div#Tooltip_Text_container a {_x000D_
text-decoration: none;_x000D_
color: black;_x000D_
cursor: default;_x000D_
font-weight: normal;_x000D_
}_x000D_
_x000D_
div#Tooltip_Text_container a span.tooltips {_x000D_
visibility: hidden;_x000D_
opacity: 0;_x000D_
transition: visibility 0s linear 0.2s, opacity 0.2s linear;_x000D_
position: absolute;_x000D_
left: 10px;_x000D_
top: 18px;_x000D_
width: 30em;_x000D_
border: 1px solid #404040;_x000D_
padding: 0.2em 0.5em;_x000D_
cursor: default;_x000D_
line-height: 140%;_x000D_
font-size: 12px;_x000D_
font-family: 'Segoe UI';_x000D_
-moz-border-radius: 3px;_x000D_
-webkit-border-radius: 3px;_x000D_
border-radius: 3px;_x000D_
-moz-box-shadow: 7px 7px 5px -5px #666;_x000D_
-webkit-box-shadow: 7px 7px 5px -5px #666;_x000D_
box-shadow: 7px 7px 5px -5px #666;_x000D_
background: #E4E5F0 repeat-x;_x000D_
}_x000D_
_x000D_
div#Tooltip_Text_container:hover a span.tooltips {_x000D_
visibility: visible;_x000D_
opacity: 1;_x000D_
transition-delay: 0.2s;_x000D_
}_x000D_
_x000D_
div#Tooltip_Text_container img {_x000D_
left: -10px;_x000D_
}_x000D_
_x000D_
div#Tooltip_Text_container:hover a span.tooltips {_x000D_
visibility: visible;_x000D_
opacity: 1;_x000D_
transition-delay: 0.2s;_x000D_
}
_x000D_
<div id="Tooltip_Text_container">_x000D_
<span><b>Tooltip headline</b></span>_x000D_
<a href="#">_x000D_
<span class="tooltips">_x000D_
<b>This is </b> a tooltip<br/>_x000D_
<b>This is </b> another tooltip<br/>_x000D_
</span>_x000D_
</a>_x000D_
<br/>Move the mousepointer to the tooltip headline above. _x000D_
</div>
_x000D_
The first span is for the displayed text, the second span for the hidden text, which is shown when you hover over it.