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hvis du selv koder kan jeg ikke hjælpe, men hvis du bruger Dreamweaver kan du bruge action mouseover og mouseout der viser et lag hvori din forklaring kan stå - mouseover show layer og mouseout hide layer

fra http://www.dynamicdrive.com/dynamicindex5/linkinfo.htm

i head tag:
<script>
<!--

/*
Textual Tooltip Script-
© Dynamic Drive (www.dynamicdrive.com)
For full source code, installation instructions,
100's more DHTML scripts, and Terms Of
Use, visit dynamicdrive.com
*/


var content=new Array()
//change the array below to the text associated with your links Expand or contract the array, depending on how many links you have
content[0]='<br><big><b>Menus and navigation systems</b></big><br>Click here for DHTML scripts that help enhance your site\'s navigability, such as collapsible menus, sliding menu bars etc.'
content[1]='<br><big><b>Special document effects</b></big><br>With the advent of DHTML, webpages are one step closer to its cousin, TV, in terms of special effects...'
content[2]='<br><big><b>Scrollers</b></big><br>Up until now, adding a scroller or tickertape to your website usually meant using a slow Java applet. Not anymore. Click here for DHTML scrollers that accomplish the same task with minimal download time.'
content[3]='<br><big><b>Image effects</b></big><br>Add lightweight effects to your existing images using these scripts. Make them fly, light up, turn static, all without paying the cost of slow downloading time.'
content[4]='<br><big><b>Links and buttons</b></big><br>Add tooltips to your text links, rollover effects to your form buttons, keyboard features to your document, and more.'
content[5]='<br><big><b>Dynamic clocks and dates</b></big><br>Time is never static, so why should your time script be? Enter for DHTML scripts that actually understand this simple truth.'
content[6]='<br><big><b>Text animations</b></big><br>Text have been silent for too long- DHTML promises to free them, with flying text, typing text, dragable text, and more.'
content[7]='<br><big><b>Browser window</b></big><br>Click here scripts related to the browser window and frames.'
content[8]='<br><big><b>Other</b></big><br>All scripts that don\'t comfortably fit in any of the above categories go here...'

function regenerate(){
window.location.reload()
}
function regenerate2(){
if (document.layers){
appear()
setTimeout("window.onresize=regenerate",450)
}
}

function changetext(whichcontent){

if (document.all||document.getElementById){
cross_el=document.getElementById? document.getElementById("descriptions"):document.all.descriptions
cross_el.innerHTML='<font face="Verdana"><small>'+whichcontent+'<font></small>'
}
else if (document.layers){
document.d1.document.d2.document.write('<font face="Verdana"><small>'+whichcontent+'</small></font>')
document.d1.document.d2.document.close()
}

}

function appear(){
document.d1.visibility='show'
}

window.onload=regenerate2


//-->
</script>


og hvor du vil have effekten:

<div id="scriptmenu" style="line-height:20px"><p><strong><font
            face="Verdana"><a href="../dynamicindex1/index.html" onMouseover="changetext(content[0])"><small>Menus
            and Navigation Systems</small></a><br>
            <a href="../dynamicindex3/index.html" onMouseover="changetext(content[1])"><small>Special&nbsp;document
            effects</small></a><br>
            <a href="../dynamicindex2/index.html" onMouseover="changetext(content[2])"><small>Scrollers</small></a><br>
            <a href="../dynamicindex4/index.html" onMouseover="changetext(content[3])"><small>Image
            effects</small></a><br>
            <a href="index.html" onMouseover="changetext(content[4])"><small>Links and buttons</small></a><br>
            <a href="../dynamicindex6/index.html" onMouseover="changetext(content[5])"><small>Dynamic
            Clocks and dates</small></a><br>
            <a href="../dynamicindex10/index.html" onMouseover="changetext(content[6])"><small>Text
            animations</small></a><br>
            <a href="../dynamicindex8/index.html" onMouseover="changetext(content[7])"><small>Browser
            Window</small></a><br>
            <a href="../dynamicindex11/index.html" onMouseover="changetext(content[8])"><small>Other</small></a></font></strong></p>
</div>

http://www.dynamicdrive.com/dynamicindex5/index.html

masser af andre muligheder til cut & paste på ovenstående link......

http://www.bosrup.com/web/overlib/

Jeg bruger pelkjaer's

En lille meget simpel en er title attributten der i w3c hører til de fleste html kommandoer:

<a href="hvorhendu.html" title="En side om uddanneslses-\nmuligheder indenfor\njern og metal industrien.">klikketekst</a>

mvh JakobA