Meinst du so?
<FORM>
<SELECT NAME="liste1" SIZE="1">
<OPTION SELECTED VALUE="">-------- Links to visit --------
<OPTION VALUE="link1.html">My first link
<OPTION VALUE="link2.html">My second link
</SELECT>
<SELECT NAME="liste2" SIZE="1">
<OPTION SELECTED VALUE="">-------- Links to visit --------
<OPTION VALUE="link1.html">My first link
<OPTION VALUE="link2.html">My second link
</SELECT>
<SELECT NAME="liste3" SIZE="1">
<OPTION SELECTED VALUE="">-------- Links to visit --------
<OPTION VALUE="link1.html">My first link
<OPTION VALUE="link2.html">My second link
</SELECT>
<INPUT TYPE="button" VALUE="Go"
onClick="if (form.liste1.selectedIndex != 0)
location = form.liste1.options[form.liste1.selectedIndex].value;
else
alert('Please choose a menu item')">
</FORM>
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