I have a button called LOOKUP, which when clicked calls a client side function that increments the nLookUp by 1 and then should open the target URL in new window. How can i accomplist this from cllient side scripting?

<script language="javascript">

var nLookUp = 0

function DoLookUp(){
location.href = "target URL";

Here location.href will open the target URL in the same window.