I have a jump menu that doesn't work properly

all i want is to select a menu and press go and opens in a new window and then
the menu goes back to choose one menu
right now if you choose a menu it opens in a new browser without the pressing
the go button which i don't want. but if u press go it opens up in the same
windows which i don't want it here is my html

<form name="form1" id="form1">
<select name="menu1" onchange="MM_jumpMenu('window.open()',this,0)">
<option value="W:\TOL - Ops\CS Operations\HelpDesk
KB\telecomottawatech2\index.html">Choose One</option>
<option
value="http://webmail.alphainter.net">Alphainter.net</option>
<option value="http://webmail.accel.net">Accel.net</option>
<option
value="http://webmail.telecomottawa.com">TelecomOttawa.com</option>
<option
value="http://webmail.telecomottawa.net">TelecomOttawa.net</option>
<option value="http://webmail.trytel.ca">Trytel.ca</option>
<option value="http://webmail.trytel.com">Trytel.com</option>
<option value="http://webmail.trytel.net">Trytel.net</option>
</select>
<input type="button" name="Button1" value="Go"
onclick="MM_jumpMenuGo('menu1','parent',1)" />
</form>

Can someone help me