UM FOLGENDE FEHLERMELDUNG HANDELT ES SICH:
Error Line 43 column 23: end tag for element "STYLE" which is not open.
document.write('</style>\n')
The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem.
If this error occured in a script section of your document, you should probably read this FAQ entry.
UND DAS IST DAS QUELLMATERIAL (aus dynamic drive)
<!--/*
Combo-Box Viewer script- Created by and Dynamicdrive.com
Visit
https://www.dynamicdrive.com/ for this script and more
This notice MUST stay intact for legal use
*///-->
<script type="text/javascript">
if (document.getElementById){
document.write('<style type="text/css">\n')
document.write('.dropcontent{display:none;}\n')
document.write('</style>\n')
hier ists
}
function contractall(){
if (document.getElementById){
var inc=0
while (document.getElementById("dropmsg"+inc)){
document.getElementById("dropmsg"+inc).style.display="none"
inc++
}
}
}
function expandone(){
if (document.getElementById){
var selectedItem=document.dropmsgform.dropmsgoption.selectedIndex
contractall()
document.getElementById("dropmsg"+selectedItem).style.display="block"
}
}
if (window.addEventListener)
window.addEventListener("load", expandone, false)
else if (window.attachEvent)
window.attachEvent("onload", expandone)
</script>