what does #someDiv mean? [closed]

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When the user puts his mouseover this object i want a message to pop up:

onmouseover="
    evt.target.setAttribute('opacity', '0.5'); 
    $('#someDiv').show();" 
onmouseout="
    evt.target.setAttribute('opacity','1)');
    $('#someDiv').hide();"

What exaclty does someDIv mean? Where do I put the text?

I am doing this and it is not showing the text at all. It is just changing the opacity.

<path 
    d="M 242.96145,653.59282 L 244.83646,650.1553 
       L 247.02397,649.8428 L 247.33647,650.62405 
       L 245.30521,653.59282 L 242.96145,653.59282 
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       L 260.77404,652.18656 L 262.33654,648.43654 
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       L 253.74275,646.40528 L 252.80525,649.99905 
       z M 282.49289,659.6866 L 286.08665,664.99912 
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       L 302.02423,668.28039 z M 307.1805,673.28041 
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       z M 329.99311,687.18672 L 331.55561,685.93672 
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       L 331.86811,690.93674 L 330.30561,689.21798 
       L 329.99311,687.18672 z"
    id="HI"
   style="fill:#ffffd0" 
   onmouseover="evt.target.setAttribute('opacity', '0.5'); $('#id').show();"
   onmouseout="evt.target.setAttribute('opacity','1)'); $('#id').hide();" /> 

---

'#someDiv' is a CSS3CSS selector which is semantically equivalent to getElementById('someDiv'), in that it will select the element with ID 'someDiv'. So:

document.getElementById('someDiv')

==

// bracket notation will return a DOM element
$("#someDiv")[0]

// leaving it out will return a jQuery object
$("#someDiv") 

---

someDiv is simply the ID associated to an element.

---

Like karim79 and others said, #someDiv selects an element with an id of "someDiv" So, to get this to work, you will also need to place an element somewhere in your HTML with this ID. Something like

<p id="someDiv">Your message</p>

---

#someDiv is the id of the element (div I believe) which you want to show. You would put your text or whatever you want to show in the element with id='someDiv'

---

#someDiv is just a item with "someDiv" as ID (that's right on CSS or Javascript).

In this case, you are ""loading"" #somediv and then, showing it (using jquery) or hiding it (with mouse in or mouse out)