Sådan?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"
http://www.w3.org/TR/html4/loose.dtd"><HTML>
<HEAD>
<TITLE>Tomt dokument</TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</HEAD>
<BODY>
<BR>
<FORM ID="minForm" NAME="minForm">
<INPUT ID="minInput" NAME="minInput" TYPE="text" VALUE="Tom" ONFOCUS="if(this.value==this.defaultValue)this.value='';" onchange="this.form.button1.value=this.value" ONBLUR="if(this.value=='')this.value=this.defaultValue;" NAME="minInput" SIZE="20">
<BR>
<BR>
<BR>
<SELECT NAME="minSelect" ID="minSelect" ONCHANGE="">
<OPTION VALUE="">-- Vælg her --<BR>
<OPTION VALUE="1">1<BR>
<OPTION VALUE="2">2<BR>
<OPTION VALUE="3">3<BR>
</SELECT>
<BR>
<BR>
<BR>
<TEXTAREA NAME="mitTextarea" ID="mitTextarea" COLS="40" ROWS="5"></TEXTAREA>
<BR>
<BR>
<button name="button1" id="button1" onmouseover="this.form.button2.style.display='block';" onclick="location.href='enAndenSide.html';">Mus over og tryk!</button><br><br>
<button name="button2" id="button2" style="display:none;">En ny knap!</button>
</FORM>
</BODY>
</HTML>