I have this input search field but i want when someone types a query and presses enter the results should appear in a new window. What do i change?

<form name="searchfrm2_mod" method="post" action="javascript: var searchword = document.searchfrm2_mod.mt_search.value;if(searchword=='search..'){searchword='';}document.location.href= 'http://www.website.com/index.php/Search.html?searchword=' + searchword ">
<div class="search" align="left">
<input id="search" class="inputbox" type="text" onkeypress="if(event.keyCode == 13){var searchword = document.searchfrm2_search.value;if(searchword=='search..'){searchword='';}document.location.href= 'http://www.website.com/index.php/Search.html?searchword=' + searchword }" onfocus="if(this.value=='search..') this.value='';" onblur="if(this.value=='') this.value='search..';" value="search.." size="40"/>

Just add target="_blank" to your <form> tag.

target="_blank" in the form tag does open a new window but the search results doesnt appear in that window it appears in the _self window

anyone else please?

Didn't see that you had javascript for the action attribute. Try this (not 100% sure if it will work, but you didn't provide the whole form):

<form target="_blank" name="searchfrm2_mod" method="get" action="http://www.website.com/index.php/Search.html" onSubmit="if (document.getElementById('searchword').value == 'search..') {document.getElementById('searchword').value = '';}">
<div class="search" align="left">
<input type="text" name="searchword" id="searchword"/>

try with target = _new