[VE][76] Error Message Feedback

Hello,

 

I want to know why the Markup Validation Service show following error at
this Homepage:
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.synapstix.de%2FImages%2FP
rivat%2F 

 

> Line 27, column 72: element "u" undefined

> ...ex.htm" accesskey="h" tabindex="1"><u>H</u>ome</a></li><li><a
href="misc.htm"

 

> You have used the element named above in your document, but the document
type you are using does not define an

> element of that name. This error is often caused by incorrect use of the
"Strict" document type with a document that

> uses frames (e.g. you must use the "Frameset" document type to get the
"<frameset>" element), or by using vendor 

> proprietary extensions such as "<spacer>" or "<marquee>" (this is usually
fixed by using CSS to achieve the desired

> effect instead).

 

Why ist the <u> </u> tag not defined??? What Tag can  i use in stead of?

 

 

 

Yours sincerely,

 

Michael Vogel