underline in js

Does anybody know, how to make underline when mouse is over??
I made something like that, but it hasn't worked...

I've heard about function ondecoration but I don't know how to put that in code...

If we are taslking about for links then it is just CSS.

a { text-decoration: none; }
a:hover { text-decoration: underline; }

No it isn't link, so it's impossible to do that by CSS. I have to make it on js. I know that is possible, but I can't find information about it anywhere...

Hmm I see what you mean.

onMouseOver="this.style.text-decoration='underline'"

doesn't do anything.

Ah it's worded differently

onMouseOver="this.style.textDecoration='underline'" onMouseOut="this.style.textDecoration='none'"

that works. Google is your friend